WO2008110092A1

WO2008110092A1 - Method, system and apparatus achieving inter-system communications

Info

Publication number: WO2008110092A1
Application number: PCT/CN2008/070393
Authority: WO
Inventors: Shulan Feng; Jinnan Liu
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-03-09
Filing date: 2008-03-03
Publication date: 2008-09-18

Abstract

This invention discloses a method implementing inter-system communications. Service base station selects repeater equipment, and sends selected repeater equipment neighboring base station access request; said repeater equipment receives said neighboring base station access request, and has access to the neighboring base station as repeater equipment; said repeater equipment receives relay information, and communicates with said service base station and neighboring base station based on said relay information. This invention also discloses system and apparatus achieving inter-system communications. Applying said method, system and apparatus could improve the relay information receipt rate of the neighboring base station.

Description

Method, system and device for realizing communication between systems

The present invention relates to mobile communication technologies, and more particularly to a method and system and apparatus for implementing inter-system communication. Background of the invention

The communication network is mainly composed of a terminal, a base station and a service network. The base station is configured to implement functions such as data transmission, resource management, and control for terminals accessing the base station in the coverage area, and the base station and the terminals served by the base station form a system. The communication mode between the base station and the terminal may be a wired connection mode or a wireless connection mode, and one base station may provide services for multiple terminals. Generally, the topology between the base station and the terminal is point-to-multipoint, that is, the terminals that belong to the same base station generally cannot communicate directly, but the information exchange through the base station. As shown in FIG. 1, FIG. 1 is a schematic diagram of a network structure in which the existing topology is a point-to-multipoint. The topology between the base station and the terminal may also be a mesh structure. In this case, the terminals of the same base station can directly communicate with each other.

Generally, the base station only receives the uplink signal sent by the terminal served by the base station, and does not receive the uplink signal sent by the terminal belonging to the neighbor base station. The communication mode between the base station and the base station is generally a wired connection through the backbone network. , does not occupy air interface resources. However, in some special cases, the base station may require the terminal it serves to send an uplink signal to the neighbor base station. For example, when the backbone network is interrupted, two different base stations need to communicate with terminals in the common coverage area. At this time, the terminal is equivalent to a relay station between two base stations/two systems; for example, in cognitive radio. In the system, the base station may require the terminal that it serves to send some necessary cognitive signals, such as a base station identifier (ID), a terminal ID, etc., to the neighbor base station to determine Interference with the neighbor base station and interference negotiation.

In the prior art, the method for performing inter-system communication through terminal relay is:

1. A base station that provides services for a terminal that implements a relay function (hereinafter referred to as a relay terminal)

(hereinafter referred to as the serving base station), the information to be relayed is sent to the relay terminal, and at the same time, the relay terminal is allocated a relay signal transmission resource, and the relay signal transmission resource may include a time-frequency resource, a coded modulation scheme used, and Transmit power, etc.

2. After receiving the information to be relayed, the relay terminal does not initiate synchronization operation with the neighbor base station, and directly sends the relay information to the neighbor base station in the allocated time-frequency resource; after the information is sent, the relay terminal does not To confirm whether the neighbor base station has correctly received the relay information.

The inventor has found that in the above prior art solution, since the relay terminal does not perform necessary uplink synchronization and power adjustment with the neighbor base station before transmitting the relay information to the neighbor base station, the relay terminal is generally in the coverage of the neighbor base station. At the edge, the channel attenuation is large, so the probability that the neighbor base station correctly receives the relay information is very low. In addition, since the location at which the relay terminal transmits the uplink signal and the modulation and coding scheme used are allocated by the serving base station, it is difficult for the neighbor base station to know at which position to receive the uplink signal of the relay terminal, and it is not known which demodulation is used. The decoding mode receives the uplink signal of the relay terminal.

In order to solve the problem that the neighbor base station has a low probability of correctly receiving the relay information and cannot know the physical information of the relay uplink signal, a pilot (Preamble) sequence may be added before the relay terminal sends the relay information to the neighbor base station. For synchronization and channel estimation. However, since the system's uplink transmission format has been set, adding the Preamble sequence will result in reduced system backward compatibility and increased base station complexity. Summary of the invention

The embodiments of the present invention provide a method for implementing inter-system communication, which can improve the correct receiving rate of the relay information by the neighboring base station. The embodiment of the invention provides a system for implementing inter-system communication, which can improve the correct receiving rate of the relay information by the neighboring base station.

The embodiments of the present invention provide a device for implementing inter-system communication, and the device can improve the correct receiving rate of the relay information by the neighboring base station.

The technical solution of the embodiment of the present invention is implemented as follows:

A method of implementing inter-system communication, the method comprising:

The terminal receives the request of the access neighbor base station sent by the serving base station, and accesses the neighbor base station as a relay terminal;

The relay terminal receives relay information, and communicates with the serving base station and the neighbor base station according to the relay information.

A method of implementing inter-system communication, the method comprising:

The serving base station selects a relay terminal, and sends an access neighbor base station request to the relay terminal;

The serving base station transmits relay information to the relay terminal to communicate with the relay terminal.

A system for implementing inter-system communication, the system comprising: a serving base station, a relay terminal, and a neighbor base station;

The serving base station is configured to select a relay terminal, send an access neighbor base station request to the relay terminal, and send the relay information to the relay terminal after the relay terminal accesses the neighbor base station Communicating with the relay terminal;

The neighboring base station is configured to access the relay terminal, and send the relay information to the relay terminal to communicate with the relay terminal;

The relay terminal is configured to, after receiving the request from the access neighbor base station of the serving base station, access the neighbor base station as a relay terminal; and receive relay information from the serving base station or the neighbor base station Obtaining, according to the relay information, the serving base station and the neighbor base station Line communication.

A device for implementing communication between systems, the device comprising: an access neighbor base station module and a communication module;

The access neighbor base station module is configured to receive an access neighbor base station request from the serving base station, and access the neighbor base station as a relay terminal;

The communication module is configured to receive relay information from the serving base station or a neighbor base station, and communicate with the serving base station and the neighbor base station according to the relay information.

It can be seen that, by using the technical solution of the embodiment of the present invention, the relay terminal receives the request of the access neighbor base station sent by the serving base station, and accesses the neighbor base station as the relay terminal; after that, the relay terminal receives the relay information, and according to the received The relay information communicates with the serving base station and the neighbor base station. Compared with the prior art, the relay terminal does not perform necessary uplink synchronization and power adjustment with the neighbor base station before transmitting the relay information to the neighbor base station, and the probability that the neighbor base station correctly receives the relay information is low. The problem is that, in the solution of the present invention, before transmitting the relay information to the neighboring base station, the relay terminal first accesses the neighbor base station, that is, performs necessary synchronization and power adjustment operations with the neighbor base station, thereby improving the relay information of the neighbor base station. The correct rate of reception. BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a network structure of a point-to-multipoint structure of an existing topology;

2 is a flow chart of an embodiment of a method of the present invention;

3 is a schematic diagram of a time sharing manner in an embodiment of the present invention;

4 is a schematic diagram of a time sharing manner in a wireless communication system according to an embodiment of the present invention; FIG. 5 is a flowchart of a preferred embodiment of the method according to the present invention; 6 is a schematic structural diagram of a system embodiment of the present invention;

Figure 7 is a schematic view showing the structure of a preferred embodiment of the system of the present invention. Mode for carrying out the invention

In the embodiment of the present invention, the serving base station sends an access neighbor base station request to the selected relay terminal, and the relay terminal receives the access neighbor base station request, and accesses the neighbor base station as a relay terminal; The relay terminal receives the relay information, and communicates with the serving base station and the neighbor base station according to the relay information.

The present invention will be further described in detail below with reference to the accompanying drawings.

2 is a flowchart of an embodiment of a method according to the present invention. As shown in FIG. 2, the method includes the following steps: Step 201: The serving base station detects whether there is a terminal in the current system that has established a connection relationship with itself and a neighboring base station, and if yes, Selecting the terminal as a relay terminal, otherwise, selecting a relay terminal from the terminals served by the terminal, and transmitting an access neighbor base station request to the selected relay terminal; the relay terminal receiving the access neighbor base station request, and As a relay terminal access to the neighbor base station.

The manner in which the serving base station selects the relay terminal from the terminals served by the serving base station is: if the serving base station specifies the neighboring base station to be communicated in advance, the serving base station selects the integrated communication performance from the common coverage area of the neighboring base station and the neighboring base station to meet the requirements. The terminal serves as a relay terminal; if the serving base station does not specify a neighbor base station to be communicated, the serving base station selects a terminal whose integrated communication performance meets the requirements from the common coverage area of itself and any neighbor base station as the relay terminal. As long as the conditions are met, the serving base station can select all of the serving terminals in the common coverage area of the serving base station and any neighboring base stations as relay terminals.

The terminal that meets the requirements herein may refer to a terminal that meets the judgment of the signal energy of the neighboring base station that meets the small amount of traffic with the serving base station. After the relay terminal is selected, the serving base station sends the access neighbor base station request to the relay terminal, and simultaneously allocates the time for accessing the neighbor base station to the relay terminal, and the time allocation principle of the access neighbor base station does not affect the relay terminal. The original business service quality (QoS). The access neighbor base station time may be a continuous time or a plurality of time periods, but the duration is such that the relay terminal can complete a complete access process with the neighbor base station, including synchronization and connection required for correct data transmission. Into the process. For example, for a wireless communication system, the necessary access procedures include a downlink physical layer synchronization process, a media access control (MAC) layer synchronization process, a process of acquiring transmission parameters, and an initial ranging process. After the process ends, the neighbor base station allocates a basic link identifier (CID) and a primary management CID to the relay terminal. Thereafter, optionally, the relay terminal may also perform capability negotiation, authentication, and registration with the neighbor base station. The relay terminal is capable of normal communication with the serving base station outside of the allocated access neighbor base station time. It should be noted that, in the access process, the relay terminal needs to notify the neighboring base station that it is not the terminal that requests the neighbor base station to serve, but the terminal that is temporarily accessed for the inter-system communication relay information. The purpose of this is to avoid Because the neighboring base station treats the relay terminal as the terminal that it serves, it causes problems such as routing errors when the relay terminal performs service transmission. Correspondingly, in the process of accessing the relay terminal, the neighboring base station needs to distinguish whether the accessed terminal is a relay terminal or a general terminal, and does not establish a service link for the relay terminal.

The relay terminal accesses the neighbor base station as a relay terminal during the allocated neighbor base station access time. If the access is successful, the relay terminal sends an access neighbor base station success message to the serving base station; if the access neighbor base station fails, the relay terminal sends an access neighbor failure message to the serving base station. Optionally, the relay terminal may feed back the reason for the failure of the accessing neighboring base station to the serving base station. The reason may be that physical layer synchronization cannot be established, MAC layer synchronization cannot be established, uplink MAC layer parameters cannot be obtained, and the downlink MAC layer cannot be obtained. Parameters, ranging process failed, etc. After receiving the access neighbor base station failure message sent by the relay terminal, the serving base station will follow the previous The selection method mentioned re-selects a new relay terminal or stops the current relay communication.

It should be noted that, the terminal may also complete the access process with the neighboring base station before receiving the synchronization request of the serving base station: Before the start of the relay communication process, each terminal to which the serving base station belongs may take the initiative in each idle period. As the relay terminal accesses each neighboring base station in the network, and saves the corresponding parameters, the terminal can actively send the message that the neighboring base station succeeds to its own serving base station. When inter-system communication is required, the serving base station may prefer a terminal that has accessed the neighbor base station as a relay terminal. In this way, when inter-system communication is required, the neighbor base station access procedure does not need to be performed, thereby saving access time.

Step 202: The relay terminal receives the relay information, and performs communication with the serving base station and the neighbor base station according to the relay information.

In this step, the relay information received by the relay terminal may be from a serving base station or from a neighbor base station. Moreover, after receiving the relay information sent by the serving base station or the neighbor base station, the relay terminal may choose to send back the success response information to the serving base station or the neighbor base station, or may not send back the response information. However, if the serving base station or the neighbor base station is configured to receive the response message of the relay terminal but does not receive the response message within a predetermined time, the serving base station or the neighbor base station will resend the relay information to the relay terminal; If the retransmission is repeated multiple times, and the number of retransmissions has exceeded the predetermined number of retransmissions, and the response message is still not received, the serving base station will reselect the relay terminal, and the neighbor base station will consider that the relay request fails, and the communication process ends. .

The serving base station allocates the inter-system communication time to the relay terminal while transmitting the relay information, so that the relay terminal transmits the request message to the neighbor base station. After receiving the relay information sent by the serving base station, the relay terminal requests the transmission resource from the neighbor base station, and sends the relay information to the neighbor base station in the transmission resource allocated by the neighbor base station, and, in the process, relaying The terminal maintains normal communication with the serving base station. After receiving the relay message of the relay terminal correctly, the neighboring base station may send back a success response message to the relay terminal, or may not send a response message to the neighboring base station. Relay terminal. After receiving the successful reception response message sent by the neighboring base station, the relay terminal may relay to the serving base station or may not relay to the serving base station.

In the process of inter-system communication between the serving base station and the neighbor base station through the relay terminal, the relay terminal and the neighbor base station perform a normal ranging process to ensure transmission quality.

If the relay terminal interrupts the communication with the neighbor base station due to the physical layer out-of-synchronization, the MAC layer out-of-synchronization or the ranging failure, the relay terminal reports the access neighbor base station failure message to the serving base station. After receiving the access neighbor base station failure message of the relay terminal, the serving base station reselects the relay terminal or ends the relay communication process.

After the relay terminal successfully accesses the neighbor base station, the neighbor base station may also actively send the relay information to the relay terminal, requesting the relay terminal to relay the relay message to the serving base station. The relay request procedure initiated by the neighboring base station is similar to the relay request procedure initiated by the serving base station, except that the relay terminal may not request additional relay information transmission resources from the serving base station, but allocates it to the serving base station for other purposes. The relay information is sent in the uplink transmission resource.

It should be noted that, in the process of performing inter-system communication by using the relay terminal, when the traffic volume of the relay terminal increases and there is insufficient time to perform service transmission with the serving base station, the serving base station may terminate the relay function of the relay terminal. In addition, another service terminal is selected as the relay terminal.

After the communication process ends, the serving base station sends a relay transmission end request to the relay terminal, and after receiving the relay transmission end request, the relay terminal sends a relay transmission end request to the neighbor base station, and the neighbor base station is correspondingly released as the middle. The resources allocated by the terminal and the context information saved for the relay terminal. Alternatively, the neighbor base station sends a relay transmission end request to the relay terminal, and after receiving the relay transmission end request, the relay terminal sends a relay transmission end request to the serving base station, and the serving base station ends the inter-system communication process accordingly. Alternatively, instead of transmitting the relay transmission end request, the neighbor base station or the relay terminal automatically terminates the communication process according to the rules set by itself: if, for example, the neighbor base station exceeds the predetermined schedule If the time has not communicated with the relay terminal, the resource allocated for the relay terminal and the context information saved for the relay terminal are automatically released; or the relay terminal does not receive the slave base station or neighbor from the serving base station for more than a predetermined time. The relay information of the base station requires the neighbor base station to release the allocated resources and the saved context information.

After receiving the end-to-system communication process end request from the serving base station or the neighbor base station, the relay terminal releases the link established with the neighbor base station and the context information saved for the link.

It should be noted that when there are more than one relay terminal, it is necessary to avoid transmission conflicts between different relay terminals of the same base station and transmission conflicts between different terminals of different base stations.

When the information that the serving base station needs to forward through the relay terminal includes more than one, the relay terminal may request the neighboring base station to release the allocated resources and the saved context information after each transmission of the relay information. Alternatively, after all the relay information is sent, the neighbor base station is requested to release the allocated resources and the saved context information.

In the embodiment of the present invention, the relay terminal needs to implement communication with two base stations, that is, the serving base station and the neighboring base station. Accordingly, the relay terminal needs to maintain two sets of resource allocation parameters and physical layer configuration parameters, including: Power adjustment amount, timing adjustment amount, frequency adjustment amount, and assigned logical channel number of the base station. The relay terminal will adopt different parameters when communicating with two different base stations.

The serving base station and the neighbor base station can work at the same frequency or at different frequencies. The relay terminal can communicate with the two base stations in a time-sharing or frequency-dividing manner, but no matter which communication method is used, it needs to be guaranteed to be reserved. The time of the relay terminal is sufficient for the relay terminal to complete communication with the neighbor base station, that is, inter-system communication, and at the same time, cannot affect normal service transmission between the relay terminal and the serving base station.

If the time sharing method is adopted, the serving base station may randomly or periodically One or more time slots in one or more frames are allocated to the relay terminal for establishing communication with the neighbor base station; or the serving base station assigns a specific time period to the relay terminal according to a preset rule. Used to establish communication with neighboring base stations, such as Common Signaling Interval (CSI) or Common Message Interval (CMI) or Common Control Channel (CXCC). Here are a few common time-sharing methods:

(1) The serving base station periodically allocates certain time slots of certain frames in a certain period of time to the relay terminal. As shown in FIG. 3, FIG. 3 is a schematic diagram of the time sharing manner in this case.

Among them, the meaning of each annotation is:

Inter-system communication start frame: The start frame number that can be assigned to the relay terminal for inter-system communication;

Inter-system communication duration: The inter-system communication process, that is, the continuous frame length at which the relay terminal communicates with the serving base station and the neighbor base station at the same time. If set to a special value, such as 0, it means that the inter-system communication is always performed according to the method until The base station terminates the inter-system communication by other means;

Interval between consecutive two inter-system communication frames: Inter-frame space between two consecutive inter-system communication frames containing inter-system communication time-frequency blocks;

Inter-system communication time-frequency block: Inter-system communication time-frequency block in each system communication frame, there may be one or more inter-system communication time-frequency blocks in an inter-system communication frame, and inter-system communication time-frequency block Can be a whole frame.

Taking a wireless communication system as an example, in a time sharing manner, the relay terminal can communicate with the serving base station during the primary subframe and/or the common subframe of the serving base station; and the secondary subframe of the serving base station and the neighbor base station The primary subframe communicates with the neighbor base station. During the secondary subframe of the serving base station, the serving base station does not send a downlink signal to the relay terminal, nor does it allocate uplink resources to the relay terminal. FIG. 4 is a schematic diagram of a time sharing manner in a wireless communication system according to an embodiment of the present invention. (2) The serving base station immediately updates the allocation mode of the inter-system communication, that is, the serving base station can notify the relay terminal of the current frame or the inter-system time-frequency block of the next frame or the following N frames randomly or according to a certain period, and can be used between systems. Communication, within the time-frequency block, the relay terminal may not communicate with the serving base station, but only with the neighbor base station. One or more intersystem time-frequency blocks may be included in one frame.

(3) According to a preset rule, in a certain period of time, for example, every 10s, a fixed number of time slots are set, for example, frames starting from ls, 2s, 4s, 8s are used for inter-system communication, In these frames, the relay terminal may not communicate with the serving base station but only with the neighbor base station.

If the relay terminal communicates with two base stations by means of frequency division, it is necessary to set two sets of transceivers in the relay terminal. In addition to the time division and frequency division modes, the relay terminal can also establish communication with two base stations at the same time by other multiplexing methods, such as code division, and is not introduced.

The above-mentioned time-sharing methods can be respectively applied in different environments and have their respective advantages, for example: If the relay terminal can receive the frame header or the subframe header of the neighbor base station in the allocated inter-system communication area, that is, it can be like When the terminal synchronizes and accesses with the neighbor base station, the relay terminal obtains the downlink physical layer frame synchronization by searching the frame header and the subframe header of the neighbor base station, and parses the message of the neighbor base station's frame header or subframe header to obtain the corresponding MAC. The layer message, and sends an uplink signal in the uplink resource allocated by the neighboring base station. The neighbor base station can allocate the necessary logical channel number, such as the basic CID and the primary management CID, to the relay terminal. At the same time, when the relay terminal accesses, it needs to indicate that it is a relay terminal, so that the neighbor base stations can distinguish. In this way, if the communication area between the systems is the secondary subframe of the serving base station and the primary subframe of the neighbor base station, the relay terminal can periodically communicate with the neighbor base station during the primary subframe of the neighbor base station, and the primary subframe of the serving base station. And/or communicating with the serving base station during a common subframe, this time sharing method has better backward compatibility. If in the allocated inter-system communication area, the relay terminal cannot normally receive the frame header and the subframe header of the neighbor base station, for example, the method of using the CXCC time slot for inter-system communication defined in the wireless communication in this embodiment, when the downlink CXCC is used The downlink signal sent by the slot does not start at the frame header of the neighbor base station, and the uplink CXCC time slot and the downlink CXCC time slot interval are far apart, which is about 100 ms. In order to support synchronization-based inter-system communication, in the downlink CXCC time slot, the neighbor base station needs to send the downlink inter-system communication message, including the Preamble of the neighbor base station and the necessary MAC layer information, and allocate the initial ranging resource to the relay terminal. . In the uplink CXCC time slot corresponding to the neighbor base station, the relay terminal sends an uplink inter-system communication message, and the transmission mode follows the previously received neighbor base station indication. In this manner, the relay terminal does not synchronize to the frame header or the subframe header of the neighbor base station, and the relay terminal completes physical layer synchronization and MAC layer synchronization in a downlink CXCC time slot of the neighbor base station, and the manner is to the relay terminal. The capability requirement is higher, but since the relay terminal does not need to establish frame synchronization with the neighbor base station, the flexibility is large.

The solution of the present invention will be further described in detail below by means of a preferred embodiment:

Figure 5 is a flow chart of a preferred embodiment of the method of the present invention. In this embodiment, it is assumed that the relay information received by the relay terminal is from the serving base station, and the serving base station needs to select the relay terminal before initiating inter-system communication. As shown in Figure 5, the following steps are included:

Step 501: The serving base station selects one or several terminals from the terminals served by the serving base station as the relay terminal.

The selection mode is: if the serving base station has specified a neighbor base station to be relayed, the serving base station selects a suitable relay terminal from the terminals in the common coverage area of itself and the neighbor base station, and the selected terminal must be correct. The signal received by the serving base station must be able to receive the signal of the neighbor base station, and the serving base station comprehensively considers the service condition of the qualified terminal and the quality of the signal of the receiving neighbor base station, and selects the optimal one or several terminals as the Relay terminal. If the serving base station does not specify the neighbor base station to be relayed, the serving base station comprehensively compares the service status of each terminal served by itself and the available resources, and selects the best one or several as the relay terminal. Since the neighboring base station to be communicated is not specified, in the subsequent process, after receiving the relay information sent by the serving base station, the selected relay terminal broadcasts the relay information to each neighboring base station in the network, and each neighboring base station How to receive the relay information and how to deal with it is not described.

In this embodiment, it is assumed that the serving base station has designated a neighbor base station to be relayed, and only one terminal is selected as the relay terminal.

502: The serving base station sends an access neighbor base station request to the relay terminal.

At the same time, the serving base station allocates the access neighbor base station time to the relay terminal. During this time, the serving base station does not send a signal to the relay terminal, and does not receive the uplink signal of the relay terminal. In general, this allocation should not affect the normal service QoS of the relay terminal. At the same time, the allocated access neighbor base station time must be long enough for the relay terminal and the neighbor base station to receive the information correctly. The access neighbor base station time may be a continuous period of time, or may include several periods of time. The relay terminal should maintain normal communication with the serving base station outside of the allocated synchronization time.

Step 503: After receiving the request of the access neighbor base station, the relay terminal attempts to access the neighbor base station as a relay terminal.

In this step, the relay terminal performs necessary access procedures with the neighbor base station within the allocated access time, and the process includes synchronization and access procedures necessary for correct data transmission, and at the same time, relaying The terminal needs to notify the neighboring base station that it is not its own terminal in the access process, but is a terminal that is temporarily accessed for relaying messages.

Step 504: The process of accessing the neighbor base station fails in step 503, and the relay terminal sends an access neighbor base station failure message to the serving base station.

The relay terminal may feed back the cause of the failure of the access neighbor base station to the serving base station. Step 505: The serving base station reselects the relay terminal.

After receiving the access neighbor base station failure message sent by the relay terminal, the serving base station reselects the new relay terminal, and the specific selection manner is the same as that described in step 501. In this step, the serving base station selects a terminal with a sub-optimal communication performance as a new relay terminal.

Step 506: The serving base station sends a neighbor base station access request to the reselected relay terminal. It should be noted that the relay terminal in this step and the following is different from the relay terminal in steps 501 to 504 (one is optimal in integrated communication performance, and the other is sub-optimal). In this embodiment, For convenience of presentation, the new relay terminal is still referred to as a relay terminal.

Steps 507 ~ 508: The relay terminal performs the access process with the neighbor base station as the relay terminal, and sends the access neighbor base station success message to the serving base station after the access neighbor base station succeeds.

Steps 509 ~ 510: The serving base station sends the relay transmission information to the relay terminal. After successfully receiving the relay transmission information, the relay terminal sends the response information to the serving base station.

At the same time, the serving base station allocates the necessary inter-system communication time for the relay terminal, so that the relay terminal communicates with the neighbor base station. During this time, the serving base station will not send a signal to the relay terminal, nor will it receive the uplink signal of the relay terminal. In general, this allocation should not affect the normal service QoS of the relay terminal; The communication time should be long enough for the relay terminal and the neighbor base station to correctly send and receive information. The inter-system communication time can be continuous for a period of time or can include several periods of time. The relay terminal should maintain normal communication with the serving base station in addition to the communication time between the assigned systems.

Steps 511 ~ 512: The relay terminal requests the transmission resource from the neighbor base station, and the neighbor base station sends the transmission resource allocated for the relay terminal to the relay terminal.

Step 513: The relay terminal sends the relay information to the neighbor base station by using the allocated transmission resource.

Step 514: After successfully receiving the relay information sent by the relay terminal, the neighbor base station sends back response information to the relay terminal, and completes relaying information from the serving base station to the neighbor base station. Process.

Steps 509 to 514 are processes for receiving, by the relay terminal, relay information from the serving base station, and transmitting the relay information to the neighboring base station to implement communication; as described above, the relay terminal may also receive the slave base station. Relay information, and send the relay information to the serving base station, as shown in steps 515 ~ 520:

Steps 515 ~ 516: The neighbor base station sends the relay information to the relay terminal, and requests the relay terminal to send the relay message to the serving base station. After receiving the relay information, the relay terminal sends back a successful reception response message to the neighbor base station.

Steps 517 to 520: The relay terminal applies for uplink transmission resources to the serving base station during the communication process with the serving base station, and sends the relay information in the allocated uplink transmission resource. After receiving the relay message, the serving base station sends the relay message. Successfully received a response message to the neighbor base station.

If the serving base station needs to send the relay information again, step 509 514 is repeated; if the neighbor base station needs to send the relay message again, steps 515 ~ 520 are repeated until all the relay information is sent.

Steps 521 to 522: The serving base station sends a relay transmission end request to the relay terminal, and after receiving the relay transmission end request, the relay terminal sends a relay transmission end request to the neighbor base station.

Step 523: After receiving the relay transmission end request sent by the relay terminal, the neighbor base station releases the resource allocated for the relay terminal and the saved context information.

If desired, step 524 can be further included: the relay terminal releases the information of the maintained neighbor base station.

Based on the foregoing method, FIG. 6 is a schematic structural diagram of a system embodiment of the present invention. As shown in FIG. 6, the system mainly includes: a serving base station 601, a relay terminal 602, and a neighbor base station 603.

The serving base station 601 is configured to detect whether there is an existing system and a neighbor in the current system. The base station 603 establishes a connection relationship terminal, if yes, selects the terminal as a relay terminal; otherwise, selects a relay terminal from the terminals served by itself; and transmits an access neighbor base station to the selected relay terminal 602. After the relay terminal 602 accesses the neighbor base station 603, it transmits relay information to the relay terminal 602, and communicates with the relay terminal 602;

The relay terminal 602 is configured to access the neighbor base station 603 as a relay terminal after receiving the request from the access neighbor base station of the serving base station 601, or actively access the neighbor base station 603 as a candidate relay terminal, and receive the The relay information of the serving base station 601 or the neighbor base station 603 communicates with the serving base station 601 and the neighbor base station 603 according to the relay information;

The neighbor base station 603 is configured to access the relay terminal 602, and send the relay information to the relay terminal 602, communicate with the relay terminal 602, and communicate with the service terminal 601 through the relay terminal 602.

The serving base station 601 is further configured to: receive an access neighbor base station success message or a neighbor base station failure message from the relay terminal 602, and reselect the relay terminal or stop the receiving when the access neighbor base station failure message is received. Communication process.

The serving base station 601 is further configured to: receive a response message from the relay terminal 602 for successfully receiving the relay information, but if the response message is not received within a predetermined time, retransmit the relay information to the relay terminal 602, and Re-selecting the relay terminal when the response message from the relay terminal 602 has not been received after the predetermined number of retransmissions is exceeded;

The neighbor base station 603 is further configured to: receive a response message from the relay terminal 602 for successfully receiving the relay information, but if the response message is not received within a predetermined time, retransmit the relay information to the relay terminal 602; When the response message from the relay terminal 602 has not been received for more than the predetermined number of retransmissions, the relay request is considered to have failed, and the communication process is ended.

The serving base station 601 is further configured to: send, by the relay terminal 602, a relay transmission end request to the neighbor base station 603; the neighbor base station 603 is further configured to receive the relay terminal 602. Contextual information.

Alternatively, the neighbor base station 603 is further configured to use the context information of the relay terminal 602 to the serving base station 601; the serving base station 601 is further configured to receive the relay transmission end request from the relay terminal 602.

The relay terminal 602 includes: an access neighbor base station module 6021 and a communication module 6022. As shown in FIG. 7, FIG. 7 is a schematic structural diagram of a system according to a preferred embodiment of the present invention.

The access neighbor base station module 6021 is configured to receive an access neighbor base station request from the serving base station 601, and after receiving the request from the access neighbor base station, access the neighbor base station 603 as a relay terminal;

The communication module 6022 is configured to receive relay information from the serving base station 601 or the neighbor base station 603, and communicate with the serving base station 601 and the neighbor base station 603 according to the relay information.

The relay terminal 602 further includes a first response module 6023 for monitoring the status of the access neighbor base station module 6021, and if the neighbor base station is successfully accessed, sending the access neighbor base station success message to the serving base station 601; otherwise, the service is provided. The base station 601 sends an access neighbor base station failure message.

The relay terminal 602 further includes a second response module 6024, configured to monitor whether the communication module 6022 successfully receives the relay information from the serving base station 601 or the neighbor base station 603, and monitors that the communication module 6022 successfully receives the service base station. After the relay information of the 601 or the neighbor base station 603, the service base station 601 or the neighbor base station 603 transmits a successful reception relay information response message.

The relay terminal 602 further includes a relay transmission end module 6025 for receiving a relay transmission end request from the serving base station 601 and transmitting it to the neighbor base station 603; or receiving a relay transmission end request from the neighbor base station 603 and transmitting to Serving base station 601.

The relay terminal 602 further includes a resource release module 6026 for receiving from the middle Following the relay transmission end request of the transmission end module 6025, the link established with the neighbor base station 603 and the context information maintained for the link are released.

It can be seen that, by adopting the technical solution of the embodiment of the present invention, the serving base station preselects the terminal with the best integrated communication performance as the relay terminal to transmit the relay information, and synchronizes with the neighbor base station before the relay terminal communicates with the neighbor base station. . Compared with the prior art, the relay terminal is at the edge of the base station, and the signal strength is weak and unsynchronized, so that the probability that the neighboring base station can correctly receive the relay information is low, and the solution in the embodiment of the present invention can improve the neighbor base station better. The correct rate of reception of relay information. In addition, the relay terminal can still perform normal communication with the serving base station during the communication with the neighbor base station, and only needs to select an appropriate communication mode. In addition, the solution in the embodiment of the present invention has less modification to the existing base station and the terminal, and the backward compatibility is good.

In conclusion, the above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalents, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for implementing inter-system communication, the method comprising: receiving, by a terminal, an access neighbor base station request sent by a serving base station, and accessing the neighbor base station as a relay terminal;

The method according to claim 1, wherein before the relay terminal accesses the neighbor base station, the method further includes: the relay terminal receiving the access neighbor base station time allocated by the serving base station;

The method for the relay terminal to access the neighbor base station as the relay terminal is: the relay terminal synchronizes with the neighbor base station and accesses the neighbor base station in the allocated access neighbor base station time.

The method according to claim 2, wherein the process of synchronizing the relay terminal with the neighboring base station and accessing the neighbor base station comprises one or any combination of the following operations:

The relay terminal performs physical layer synchronization with the neighbor base station, media access control MAC layer synchronization, acquisition of transmission parameters, initial ranging process, capability negotiation process, authentication process, and registration process.

The method according to claim 2 or 3, wherein the process of the relay terminal accessing the neighbor base station further includes:

The relay terminal notifies the neighboring base station that the relay terminal is temporarily accessed for information relay.

The method according to claim 4, wherein after the relay terminal accesses the neighboring base station, the method further includes: If the neighboring base station is successfully connected, the relay terminal sends an access neighbor base station success message to the serving base station;

If the access to the neighbor base station fails, the relay terminal sends an access neighbor base station failure message to the serving base station.

The method according to claim 1, wherein the method for the relay terminal to communicate with the serving base station and the neighbor base station is:

After receiving the relay information from the serving base station, the relay terminal requests a transmission resource from the neighboring base station; and the relay terminal sends the relay information to the neighbor base station in the allocated transmission resource.

After receiving the relay information from the neighbor base station, the relay terminal requests a transmission resource from the service base station, and the relay terminal sends the relay information to the serving base station by using an existing uplink transmission resource.

The method according to claim 6 or 7, wherein, in the process of the relay terminal communicating with the neighbor base station, the relay terminal performs a ranging process with the neighbor base station.

The method according to claim 6 or 7, wherein the communication process between the relay terminal and the serving base station and the neighbor base station further includes:

If the relay terminal interrupts communication with the neighbor base station due to physical layer out-of-synchronization, MAC layer out-of-synchronization, or ranging failure, the relay terminal reports the access to the serving base station. Neighbor base station failure message;

After receiving the access neighbor base station failure message sent by the relay terminal, the serving base station reselects the relay terminal or ends the relay communication process.

10. The method according to claim 6 or 7, wherein the relay terminal In the process of communicating with the serving base station and the neighboring base station, the method further includes:

If the relay terminal is in communication with the serving base station and the neighbor base station, the traffic of the relay terminal is too large, and there is insufficient time for service transmission with the serving base station, the serving base station terminates The relay function of the relay terminal is described, and the relay terminal is reselected.

The serving base station sends a relay transmission end request to the relay terminal; after receiving the relay transmission end request, the relay terminal sends the context information saved by the relay transmission end to the neighbor base station;

Alternatively, the neighboring base station or the relay terminal automatically ends the communication process according to the rules set by itself if the conditions are met.

The method according to claim 11, wherein the communication process between the relay terminal and the serving base station and the neighbor base station further includes:

If the relay terminal receives a plurality of pieces of relay information, the relay terminal requests the neighboring base station to release the resources allocated to itself and the saved context information after each transmission of the relay information is completed. Or, after all the relay information is sent, request the neighbor base station to release the resources allocated for itself and the saved context information.

The method according to claim 1, wherein the method for the relay terminal to communicate with the serving base station and the neighbor base station is: line communication.

14. The method according to claim 13, wherein if the time sharing mode is adopted, the serving base station randomly or periodically performs one of more than one frame within a certain period of time. The time slot is allocated to the relay terminal for establishing communication with the neighboring base station; or the serving base station allocates a specific time period to the relay terminal by using a preset rule, and is used for The neighbor base station establishes communication.

The method according to claim 1, wherein the relay terminal communicates with the serving base station during a primary subframe of the serving base station; and during the primary subframe of the neighbor base station, with the neighbor base station Communication.

A method for implementing inter-system communication, the method comprising: the serving base station selecting a relay terminal, and transmitting a request for accessing the neighbor base station to the relay terminal;

The method according to claim 16, wherein the selecting, by the serving base station, the relay terminal comprises:

The serving base station detects whether there is a terminal in the current system that has established a connection relationship with itself and the neighboring base station, and if so, selects the terminal as a relay terminal; otherwise, selects a relay terminal from the terminals served by itself.

The method according to claim 16, wherein the selecting, by the serving base station, the relay terminal from the terminals served by the serving base station includes:

The serving base station pre-designates a neighboring base station to be communicated, and the serving base station selects, as a relay terminal, a terminal whose integrated communication performance meets the requirements from a common coverage area of itself and the neighbor base station; or

The serving base station does not specify a neighboring base station to be communicated, and the serving base station selects a terminal whose integrated communication performance meets the requirements from the common coverage area of itself and any neighboring base station as a relay terminal.

The method according to claim 17 or 18, characterized in that the service base The station selects one or more relay terminals from the terminals served by itself.

The method according to claim 16, wherein the sending, by the serving base station, the relay information to the relay terminal further comprises the following steps:

Determining, according to whether the relay terminal successfully sends the response message of the relay information to the serving base station, when the serving base station does not receive the response message from the relay terminal within a predetermined time, the serving base station re-directs The relay terminal transmits relay information.

The method according to claim 20, wherein, when the serving base station does not receive the response message from the relay terminal within a predetermined time, the serving base station sends the message to the relay terminal again. After the number of times the information exceeds the predetermined number of retransmissions and the response message from the relay terminal has not been received, the serving base station reselects the relay terminal.

22. A system for implementing inter-system communication, the system comprising: a service base station, a relay terminal, and a neighbor base station;

The relay terminal is configured to, after receiving the request from the access neighbor base station of the serving base station, access the neighbor base station as a relay terminal; and receive relay information from the serving base station or the neighbor base station And communicating with the serving base station and the neighbor base station according to the relay information.

The system according to claim 22, wherein the serving base station is further configured to: receive an access neighbor base station success message or a neighbor base station failure message from the relay terminal, and receive the When the access neighbor base station failure message is described, the relay terminal is reselected or the communication process is stopped.

24. The system of claim 22, wherein:

The serving base station is further configured to: receive a response message from the relay terminal that successfully receives the relay information, and if the response message is not received within a predetermined time, retransmit the relay information to the relay terminal. And reselecting the relay terminal when the response message from the relay terminal has not been received after exceeding the predetermined number of retransmissions;

The neighboring base station is further configured to: receive a response message from the relay terminal that successfully receives the relay information, and if the response message is not received within a predetermined time, retransmit the relay information to the relay terminal. And when the response message from the relay terminal has not been received for more than the predetermined number of retransmissions, the relay request is considered to have failed, and the communication process is ended.

25. The system of claim 22, wherein

The serving base station is further configured to: send, by the relay terminal, a relay transmission end request to the neighbor base station; the neighbor base station is further configured to receive the Chinese information from the relay terminal,

Or the neighboring base station is further configured to send context information to the serving base station by using a relay terminal, where the serving base station is further configured to receive a relay transmission end request from the relay terminal.

26. An apparatus for implementing inter-system communication, the apparatus comprising: accessing a neighbor base station module and a communication module;

The access neighbor base station module is configured to receive an access neighbor base station request from the serving base station, and access the neighbor base station;

27. The device of claim 26, wherein the device further Includes:

a first response module, configured to monitor a status of the access neighbor base station module, and if the neighbor base station is successfully accessed, send an access neighbor base station success message to the serving base station; otherwise, send an access neighbor to the serving base station Base station failure message.

The device according to claim 26, further comprising:

a second response module, configured to monitor whether the communication module successfully receives relay information from the serving base station or a neighbor base station, and detects that the communication module successfully receives from the serving base station or a neighbor base station After the information, a successful receiving relay information response message is sent to the serving base station or the neighbor base station.

The device according to claim 26, further comprising:

And a relay transmission end module, configured to receive a relay transmission end request from the serving base station and send the request to the neighbor base station; or receive a relay transmission end request from the neighbor base station and send the request to the serving base station.

The device according to claim 29, further comprising:

And a resource release module, configured to receive a relay transmission end request from the relay transmission end module, release a link established with the neighbor base station, and context information maintained for the link.