CN1996784A - A method for sensing the pilot frequency, collecting the network information, and broadcasting them to the terminal - Google Patents

Abstract

The invention discloses a method for collecting network information by applying a perceptual pilot channel and broadcasting it to a terminal. The method includes the steps of: using the out-of-band perceptual pilot channel to gather frequency points of the out-of-band perceptual pilot channel, and at the same time at the frequency point Each frequency point in the set broadcasts the same out-of-band network information; the in-band sensing pilot channel broadcasts the in-band network information for the cell on the downlink broadcast channel of the existing wireless access network, so that the out-of-band sensing pilot channel and the out-of-band sensing pilot channel The in-band sensory pilot channel constitutes a joint pilot channel network architecture, in which the out-of-band sensory pilot channel transmitting base station adopts large-area coverage, and the in-band sensory pilot channel transmitting base station adopts cell coverage. The method of the invention provides timely, accurate and comprehensive network information for the reconfiguration terminal in the heterogeneous network so as to realize fast and optimized network perception and selective access.

Description

A method of collecting network information and broadcasting it to terminals by using a perceptual pilot channel

technical field

The invention relates to a method for collecting and broadcasting network information in a heterogeneous communication system, in particular to a method for collecting and broadcasting network information to a terminal using a perceptual pilot channel.

Background technique

Currently, the telecommunications world is undergoing some fundamental changes to accommodate increasing and changing user needs. The most interesting research point is in the field of wireless communication, the main purpose is to realize faster and easier communication. The existing wireless communication technology includes a variety of wireless access standards: GSM system, GPRS system, UMTS system, broadband wireless access system, wireless local area network, digital image broadcasting system (DVB), CDMA2000 system, PHS system, satellite communication, satellite Positioning and various short-range communication standards. Due to differences in design goals and application ranges, these devices will exist in our lives widely and for a long time. These independent wireless access technologies form a globally distributed and coordinated wireless communication system, which is called a heterogeneous wireless communication system. Its goal is to provide users with innovative, differentiated and higher-quality services in a coordinated manner according to user requirements and under acceptable cost-effective conditions. This means that network operators can use different wireless access technologies to provide users with appropriate services under specific conditions such as different time and space. Terminals with reconfiguration capabilities (reconfiguration terminals) choose to access a suitable network according to user preferences, network context, and service requirements. Therefore, timely and accurate grasp of network information is very important for reconfiguring terminals to complete selective network access. However, the application of dynamic spectrum allocation schemes such as Dynamic Spectrum Allocation (DSA) and Flexible Spectrum Management (FSM) makes it impossible for the reconfiguration terminal to determine the operating frequency bands of different wireless access networks in a timely and accurate manner. At this time, the reconfiguration terminal must perform a full-frequency scan to discover currently available wireless access networks and corresponding operating frequency bands. However, this process takes too long and consumes a lot of power to shorten the terminal use time. Even if full-frequency scanning is performed, due to the limited reconfiguration software stored in the reconfiguration terminal, it is impossible to reconfigure itself into each wireless access technology. Scan to discover the corresponding wireless access network, and the stride of the scan also has a huge impact on the scan results. It can be seen that full-frequency scanning cannot really solve the problem that reconfigured terminals cannot obtain network information in a heterogeneous wireless communication system.

Currently, the only solution to this problem is the out-band Cognitive Pilot Channel (CPC). This out-of-band sensing pilot channel broadcasts network information using a globally consistent frequency band. The reconfiguration terminal extracts network information by listening to the sensing pilot channel to complete network selective access. However, there are certain problems in this out-of-band sensing pilot channel. First of all, due to the current spectrum allocation schemes of various countries are relatively independent, it is difficult to find a universal frequency band to carry the out-of-band sensing pilot channel; secondly, because the out-of-band sensing pilot channel broadcasts network information globally, its information volume is huge, then even if there is such a global common frequency band, it is not enough to carry such a huge amount of information. Therefore, a plan is proposed to broadcast global network information in three levels: the first layer: country layer, information includes: country code; second layer: operator layer, information includes: codes of various operators in this country; The third layer: the wireless access network layer, the information includes: the code of the wireless access network operated by this operator and its operating frequency band. This solution still has a defect: the reconfiguration terminal cannot know the situation of the wireless access network operated by it before determining the operator, that is, it cannot obtain comprehensive network information.

Based on the analysis of the above requirements and research status, to solve the problem of network information provision in the existing heterogeneous wireless communication system, we design a method of collecting network information and broadcasting it to the terminal using the application-aware pilot channel. Provide timely, accurate and comprehensive network information for reconfiguration terminals to achieve fast and optimized network selective access.

Contents of the invention

The invention overcomes the deficiencies in the prior art and provides a method for collecting network information by using a perceptual pilot channel and broadcasting it to a terminal. The method of the invention provides timely, accurate and comprehensive network information for the reconfiguration terminal in the heterogeneous network so as to realize fast and optimized network perception and selective access.

According to the present invention, there is provided a method for collecting network information and broadcasting it to a terminal using a perceptual pilot channel, the method includes the steps of:

The out-of-band sensing pilot channel utilizes a frequency point set of the out-of-band sensing pilot channel, and simultaneously broadcasts the same out-of-band network information at each frequency point in the frequency point set;

The in-band sensing pilot channel broadcasts the in-band network information for the cell on the downlink broadcast channel of the existing wireless access network, so that the out-of-band sensing pilot channel and the in-band sensing pilot channel constitute a joint pilot channel network architecture,

The out-of-band sensing pilot channel transmitting base station adopts large-area coverage, and the in-band sensing pilot channel transmitting base station adopts cell coverage.

Preferably, the out-of-band sensing pilot channel is independent of any kind of wireless access network, and broadcasts out-of-band network information on a global scale by using a global common channel.

Preferably, the out-of-band network information includes country code, operator code, wireless access network type and corresponding operating frequency band.

Preferably, the frequency point set of the out-of-band sensing pilot channel is composed of free frequency points available in each country provided by each country according to its spectrum resource allocation strategy and spectrum occupancy situation.

Preferably, there are multiple wireless access networks in the large area.

Preferably, the in-band sensing pilot channel is divided into a downlink channel and an uplink channel.

Preferably, the downlink channel is used to broadcast in-band network information in the cell.

Preferably, the in-band network information includes network information of the current cell and network information of neighboring cells.

Preferably, the network information of the current cell and the network information of the neighboring cell include the same information unit, and the specific values of each information unit are different according to the wireless communication network environment of each cell.

Preferably, the information unit includes a general network information unit and a network information unit used by the terminal for network selection and reconfiguration.

Preferably, the general network information unit includes: country code, operator code, wireless access network type and corresponding operating frequency band.

Preferably, the network information elements required by the terminal for network selection include: network utilization, available QoS, service fee, power consumption, security, mobility and handover smoothness.

Preferably, the network information unit required for reconfiguration of the terminal includes: the type, size, manufacturer, version number, download channel code and transmission type of software to be downloaded for reconfiguration.

Preferably, the transmission type includes broadcast, multicast and unicast.

Preferably, the neighbor cell is relative to the current cell, and the operator of each cell maintains its own neighbor cell list.

Preferably, the neighbor cell list includes three kinds of neighbor cells: horizontal switching cells, vertical switching cells, and software downloading cells.

Preferably, the horizontal handover cell means that the adjacent cell and the own cell have a coverage overlapping area or a common cell boundary, and the two cells use the same radio access technology, and the terminal does not need to reconfigure for switching between them.

Preferably, the vertical cell switching means that the adjacent cell and the own cell have coverage overlapping areas or common cell boundaries, and the two cells use different wireless access technologies, and the terminal must be reconfigured for switching between them.

Preferably, the software downloading cell refers to an adjacent cell designed to ensure that the reconfiguration process is completed in time, and the terminal needs to complete the downloading of the software required for reconfiguration in advance. There may be no coverage overlap or common cell boundary between neighboring cells and this cell. Preferably, the uplink channel is used for the terminal to feed back network information to the cognitive pilot channel server.

Preferably, the method of the present invention also includes the steps of:

Whether in the active state or the standby state, the terminal installed with the cognitive radio module can detect the network environment, and periodically feed back the detection information to the base station or access point of the wireless access network through the uplink channel.

The base station or access point feeds back the network information from the terminal to the perception pilot channel server through the wired network,

The perception pilot channel server stores and analyzes the feedback information,

The updated in-band network information is sent to each base station or access point according to the location of each cell, and the updated out-of-band network information is sent to the out-of-band sensing pilot channel transmitting base station.

Compared with the prior art, the beneficial effects of the present invention are: (1) realize the global coverage of the out-of-band perception pilot channel and solve the problem of insufficient bandwidth of the out-of-band perception pilot channel; The shortcoming that the terminal cannot fully obtain network information; (3) Make full use of the existing wireless access network channel to broadcast network information, which is easy to implement; (4) To ensure the timely and accurate information update method of the network information of the perception pilot channel ; (5) Provide timely, accurate and comprehensive network information for reconfiguration terminals to achieve fast and optimized network selective access; (6) This method solves the problem of perception in indoor, underground environments, mountainous areas and other areas with unsatisfactory coverage Pilot channel coverage issues.

Description of drawings

Fig. 1 is the network architecture of joint in-band and out-of-band perception pilot channels according to the present invention;

Fig. 2 is the embodiment of the out-of-band perception pilot channel frequency point set according to the present invention;

Fig. 3 is an application scenario according to the present invention;

Fig. 4 is a neighbor list and a neighbor type in Fig. 3;

Figure 5 is an out-of-band network information element according to the present invention;

Figure 6 is an in-band network information element according to the present invention.

Detailed ways

According to the basic idea of the present invention, the method of collecting network information and broadcasting it to the terminal using the sensing pilot channel of the present invention includes applying a specific wireless access technology to the out-of-band sensing pilot channel, and using a global channel to transmit information globally Broadcast out-of-band network information, including country code, operator code, wireless access network type and corresponding operating frequency band. The out-of-band sensing pilot channel and the in-band sensing pilot channel constitute a joint pilot channel network architecture.

The global common channel used by the out-of-band pilot channel is a set of frequency points of the out-of-band sensing pilot channel, and each country provides idle frequency points available for use in the country according to its own spectrum resource allocation strategy and spectrum occupancy to form an out-of-band sensing pilot channel A set of frequency points, the out-of-band sensing pilot channel transmitting base station simultaneously broadcasts the same out-of-band network information at each frequency point in the set of frequency points.

The out-of-band sensing pilot channel and the in-band sensing pilot channel constitute a joint pilot channel network architecture, the out-of-band sensing pilot channel transmitting base station adopts large-area coverage, and there are multiple wireless access networks in a large area , these wireless access networks use cell coverage compared to the out-of-band sensing pilot channel, and the in-band sensing pilot channel uses the existing wireless access network channel to provide seamless coverage for the cell.

The in-band sensing pilot channel is divided into a downlink channel and an uplink channel. The downlink channel is used to broadcast in-band network information in the local cell. The in-band network information includes the network information of the local cell and the network information of neighboring cells. The neighbor cell is relative to the current cell, and each cell operator maintains its own neighbor cell list. The adjacent cell list includes three types of adjacent cells: horizontal switching cell, vertical switching cell, and software downloading cell. The horizontal handover cell means that the neighbor cell and the own cell have coverage overlapping areas or common cell boundaries, and the two cells use the same wireless access technology, and the terminal does not need to be reconfigured for handover here; the vertical handover cell means that the neighbor cell and the local cell The cell has a coverage overlapping area or a public cell boundary, and the two cells use different wireless access technologies, and the terminal must be reconfigured to switch between them; the software download cell refers to the terminal that needs to be reconfigured in advance to ensure that the reconfiguration process is completed in time. Complete the download work of the software required for reconfiguration, and design the adjacent cell. There may be no coverage overlap or common cell boundary between neighboring cells and this cell. The network information of the local cell and the network information of the adjacent cell contain the same information unit, and the specific value of each information unit is different according to the wireless communication network environment of each cell. The information elements include general network information elements and network information elements used by terminals for network selection and reconfiguration. The general network information unit includes: country code, operator code, wireless access network type and corresponding operating frequency band; the network information unit required by the terminal for network selection includes: network utilization rate, available QoS, service fee, power consumption volume, security, mobility, and smoothness of handoffs. The network information units required by the terminal for reconfiguration include: the type, size, manufacturer, version number, download channel code, and transmission type (broadcast, multicast, unicast) of the software to be downloaded for reconfiguration.

The uplink channel is used for the terminal to feed back network information to the cognitive pilot channel server. The terminal is equipped with a cognitive radio module. Whether it is in the active state or in the standby state, the terminal can detect the network environment and periodically feed back the detection information to the base station or access point of the wireless access network through the uplink channel, and then the base station or access point passes The wired network feeds back the network information from the terminal to the perceptual pilot channel server, the perceptual pilot channel server stores and analyzes the feedback information, sends the updated in-band network information to each base station or access point according to the location of each cell, and Send the updated out-of-band network information to the out-of-band sensing pilot channel transmitting base station.

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

FIG. 1 is an embodiment of a network architecture of a joint in-band and out-of-band cognitive pilot channel according to the present invention. Area 1 represents the large area covered by the out-of-band sensing pilot channel, and the transmitting base station 2 uses the frequency points of the out-of-band sensing pilot channel to broadcast out-of-band network information on a global scale. The out-of-band network information includes country codes and operator codes , wireless access network type and corresponding operating frequency band. There are 4 different wireless access networks in area 1. These wireless access networks use cell coverage relative to the out-of-band sensing pilot channel. Two of the cellular wireless access networks have a coverage of cell 3 and the cellular cell 4; two kinds of wireless local area networks, the coverage of which is the hotspot cell 5 and the hotspot cell 6. Each base station 7 and access point 8 broadcasts in-band network information in the cell through the downlink channel 12 . In addition, each base station 7 and access point 8 collects network information sensed by the terminal 13 through the uplink channel 11 and feeds the information back to the perception pilot channel server 10 through the wired network 9 .

Fig. 2 is an embodiment of the frequency point set of the out-of-band sensing pilot channel of the present invention. Each country or organization (European Union, China, South Korea, North America) provides a set 14 of available frequency bands within the country or region as a set of out-of-band sensing pilot channel frequency points.

Fig. 3 is an application scenario of the present invention. Out-of-band sensing pilot channel area 15 covers city 1, and out-of-band sensing pilot channel area 16 covers city 2. Cells BS1, BS2, and BS3 use one wireless access technology, and cells BS4, BS5 use another. Wireless access technology, hotspot cells A and D adopt a wireless local area network access technology, and hotspot cells B and C adopt another wireless LAN access technology. Among them, hotspot cells A and B are railway stations in two cities, respectively. Hotspot cells C and D are the airports of two cities respectively. Cells BS1, BS2, BS3, BS4, and BS5 and hotspot cells A, B, C, and D broadcast the in-band network information of the cells.

Fig. 4 is the list of neighboring cells and the types of neighboring cells in Fig. 3 . Among them, the horizontal row represents the own cell, and the column represents the neighboring cell. HHO means a horizontal handover cell, VHO means a vertical handover cell, and DL means a software download cell. Among them, BS4 is the downloading cell of BS2 because considering that the two cells are connected by a railway, the terminal moves relatively fast. Therefore, in order to ensure that the reconfiguration is completed when the terminal enters BS4, the software download needs to be started in BS2 in advance. Therefore BS4 is the downloading cell of BS2. BS5 is the same as BS3. Hotspot cells C and D are mutually downloading cells because hotspot cells C and D are airports, and the terminal needs to complete the software download before the plane takes off, and start up for reconfiguration after arriving at the destination airport, so hotspot cells C and D are mutually downloading cells.

Fig. 5 is an out-of-band network information element of the present invention.

Figure 6 is an in-band network information element of the present invention. Information unit 17 is a general information unit, information unit 18 is a network information unit used by the terminal for network selection, and information unit 19 is a network information unit used by the terminal for reconfiguration.

Claims (21)

1. A method for collecting network information by using a perceptual pilot channel and broadcasting it to a terminal, the method comprising the steps of: The out-of-band sensing pilot channel utilizes a frequency point set of the out-of-band sensing pilot channel, and simultaneously broadcasts the same out-of-band network information at each frequency point in the frequency point set; The in-band sensing pilot channel broadcasts the in-band network information for the cell on the downlink broadcast channel of the existing wireless access network, so that the out-of-band sensing pilot channel and the in-band sensing pilot channel constitute a joint pilot channel network architecture, The out-of-band sensing pilot channel transmitting base station adopts large-area coverage, and the in-band sensing pilot channel transmitting base station adopts cell coverage. 2. The method according to claim 1, wherein the out-of-band sensing pilot channel is independent of any kind of radio access network, and uses a global common channel to broadcast out-of-band network information on a global scale. 3. The method according to claim 2, wherein the out-of-band network information includes country code, operator code, wireless access network type and corresponding operating frequency band. 4. The method according to claim 1, wherein the set of frequency points of the out-of-band sensing pilot channel is composed of free frequency points available in each country provided by each country according to its spectrum resource allocation strategy and spectrum occupancy conditions. 5. The method according to claim 1, wherein there may be multiple radio access networks in the large area. 6. The method according to claim 1, wherein the in-band cognitive pilot channel is divided into a downlink channel and an uplink channel. 7. The method according to claim 6, wherein the downlink channel is used to broadcast in-band network information in the cell. 8. The method according to claim 7, wherein the in-band network information includes network information of the current cell and network information of neighboring cells. 9. The method according to claim 8, wherein the network information of the local cell and the network information of the neighboring cell contain the same information unit, and the specific value of each information unit is different according to the wireless communication network environment of each cell. 10. The method according to claim 9, wherein the information elements include general network information elements and network information elements used by the terminal for network selection and reconfiguration. 11. The method according to claim 10, wherein the general network information element includes: country code, operator code, wireless access network type and corresponding operating frequency band. 12. The method according to claim 10, wherein the network information elements required by the terminal for network selection include: network utilization, available QoS, service fee, power consumption, security, mobility, and handover smoothness . 13. The method according to claim 10, wherein the network information elements required for terminal reconfiguration include: software type, size, manufacturer, version number, download channel code and transmission type required for reconfiguration. 14. The method of claim 13, wherein the transmission type includes broadcast, multicast, unicast. 15. The method according to claim 9, wherein the neighbor cell is relative to the current cell, and the operator of each cell maintains its own neighbor cell list. 16. The method according to claim 15, wherein the neighbor cell list includes three kinds of neighbor cells: horizontal switching cells, vertical switching cells, and software downloading cells. 17. The method according to claim 16, wherein the horizontal cell handover means that the adjacent cell and the own cell have coverage overlapping areas or common cell boundaries, and the two cells use the same wireless access technology, and the terminal does not need to switch between them. Do a reconfiguration. 18. The method according to claim 16, wherein the vertical cell handover means that the adjacent cell and the own cell have coverage overlapping areas or common cell boundaries, and the two cells use different wireless access technologies, and the terminal must perform handover between these two cells. Reconfigure. 19. The method according to claim 16, wherein the software downloading cell refers to an adjacent cell designed to ensure that the reconfiguration process is completed in time, and the terminal needs to complete the downloading of the software required for reconfiguration in advance; There may be no coverage overlap or common cell boundaries between them. 20. The method according to claim 6, wherein the uplink channel is used for the terminal to feed back network information to the cognitive pilot channel server. 21. The method of claim 20, further comprising the step of: Whether in the active state or the standby state, the terminal installed with the cognitive radio module detects the network environment at all times, and periodically feeds back the detection information to the base station or access point of the wireless access network through the uplink channel. The base station or access point feeds back the network information from the terminal to the perception pilot channel server through the wired network, sensory pilot channel server storage, Analyze network information, and generate new in-band and out-of-band network information according to specific algorithms and objectives; The updated in-band network information is sent to each base station or access point according to the location of each cell, and the updated out-of-band network information is sent to the out-of-band sensing pilot channel transmitting base station.

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