WO2008043242A1 - Procédé destiné à amorcer et à stopper une fonction relais d'une station relais et station relais basée sur ce procédé - Google Patents

Procédé destiné à amorcer et à stopper une fonction relais d'une station relais et station relais basée sur ce procédé Download PDF

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Publication number
WO2008043242A1
WO2008043242A1 PCT/CN2007/002646 CN2007002646W WO2008043242A1 WO 2008043242 A1 WO2008043242 A1 WO 2008043242A1 CN 2007002646 W CN2007002646 W CN 2007002646W WO 2008043242 A1 WO2008043242 A1 WO 2008043242A1
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WO
WIPO (PCT)
Prior art keywords
relay
station
relay function
base station
function
Prior art date
Application number
PCT/CN2007/002646
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English (en)
Chinese (zh)
Inventor
Aimin Zhang
Zheng Shang
Yuanyuan Wang
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008043242A1 publication Critical patent/WO2008043242A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15557—Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode

Definitions

  • the present invention relates to a wireless communication system, and more particularly to a method for starting and stopping a relay function of a wireless relay station in a wireless communication system, and a wireless relay station based on the above method.
  • a wireless communication system communication between a base station and a mobile terminal is performed wirelessly by electromagnetic wave signals. Since electromagnetic wave signals are affected by path attenuation, building occlusion, and the environment, wireless signal strength becomes weak in some places, and the communication quality of mobile terminals located in these areas decreases. As demand for broadband communications and wireless bandwidth grows, higher and higher carrier frequencies are being used in new protocols and systems. However, since the attenuation in the electromagnetic wave transmission increases as its frequency increases, the high carrier frequency is inevitably faced with a problem of high attenuation, thereby further limiting the coverage of the base station. In order to solve the coverage problem of the above base station, it is generally required to use a wireless relay station to enhance the wireless communication signal between the base station and the mobile station.
  • Figure 1 shows a structure of a wireless communication system including a wireless relay station.
  • the base station cannot directly cover the mobile station 2 and the mobile station 3, but can implement coverage by relaying of the relay station 1 and the relay station 2, respectively.
  • the owner of the relay station can be either an operator or a user.
  • a relay station For a relay station whose ownership belongs to the operator, its purpose is to provide better service to the user. Its main function is to serve as a relay.
  • This relay station is a dedicated relay station.
  • the relay station owned by the user is actually a dual-function terminal, and the user can configure the terminal as a relay station mode or an ordinary terminal. Mode, this relay station is a non-dedicated relay station.
  • a user relay station can be placed near the window of the office.
  • the relay station provides relay services for user terminals in the office, which can save battery consumption of the user terminal and provide higher throughput for these users.
  • One of the purposes of using a relay station is to achieve a large coverage area at a low cost, and therefore, many relay stations are designed to operate in a time division duplex or a frequency division half duplex mode.
  • the so-called time division duplexing means that the same frequency point is used for transmission and reception, but it is staggered in time, that is, it cannot be received when transmitting, and cannot be transmitted when receiving.
  • Frequency division half-duplex refers to the use of different frequencies for transmission and reception, and is also staggered in time. This design can shift the time for the relay station to send and receive data, so the relay station only needs to use one set of RF equipment. Due to the high cost of RF equipment, this design can effectively reduce the cost of the relay station.
  • Existing relay stations usually have two implementations, one is an analog relay station and the other is a digital relay station.
  • GSM Global System Mobile
  • CDMA2000 Code Division Multiple Access 2000
  • the operating frequency of the analog relay station is set to be consistent with the operating frequency of the base station.
  • the signal relay between the base station and the mobile terminal is completed by amplifying the received signal and then forwarding the signal.
  • the disadvantage of this approach is that it amplifies the wanted signal while amplifying the wanted signal, which adversely affects the communication quantity.
  • the analog relay station has the possibility of generating self-oscillation, affecting its own and even the normality of the base station.
  • the analog relay station joins the network, it does not negotiate with the base station, and after accessing the network, it accesses the network to participate in data relay, and the base station cannot control the work of the relay station.
  • the digital relay station decodes the received signal first, re-encodes it, and then forwards it out.
  • the digital relay station can perform error correction processing on the received signal, and does not superimpose the accumulated noise in the signal, and has better performance than the analog relay station.
  • the digital relay station needs to access the network first in the data relay. At present, there is no negotiation mechanism about how the digital relay station accesses the network and performs the relay function. There is also a problem that the base station cannot control the work of the relay station. Summary of the invention
  • an object of the present invention is to provide a method of starting and stopping a relay function of a wireless relay station, respectively, and implementing control of starting and stopping of a relay station, respectively.
  • Another object of the present invention is to provide a relay station capable of automatically setting its own operating state in accordance with a received command.
  • a method for initiating a relay function of a wireless relay station includes the following steps:
  • the first station sends a second start relay function request message to the second station;
  • the second station After receiving the second initiation relay function request message, the second station sends an accept request response message to the first site;
  • a method for stopping a relay function of a wireless relay station includes the following steps:
  • the first station sends a second stop relay function request message to the second station;
  • the second station After receiving the request message of the second stop relay function, the second station sends an accept request response message to the first station;
  • the embodiment of the present invention further provides a wireless relay station, including: a receiving module, configured to receive a second start relay function request message or a second stop relay function request message;
  • an execution module configured to perform an operation of starting a relay function of the self according to the message received by the receiving module, or performing an operation of stopping the relay function of the self.
  • the method for starting and stopping the relay function of the wireless relay station provides a negotiation mechanism for implementing the relay station in two different modes of the terminal and the relay, thereby making The base station can control the start and stop of the relay station according to the performance of the wireless communication system.
  • the start and stop relay functions can be initiated not only by the base station but also by the relay station, thereby controlling the user to hold Some relay stations provide the party
  • the relay station provided by the foregoing method according to the foregoing method can set its own working mode according to the received start or stop relay function request message, thereby accepting the control of the base station.
  • 1 is a structure of a wireless communication system including a wireless relay station in the prior art
  • FIG. 2 is a schematic structural diagram of a first frame used in an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a second frame used in an embodiment of the present invention.
  • FIG. 4A, FIG. 4B and FIG. 4C are flowcharts of a method for initiating a relay function request initiated by a base station according to an embodiment of the present invention
  • FIG. 5A and FIG. 5B are flowcharts showing a process of initiating a relay function request initiated by a relay station according to an embodiment of the present invention
  • FIG. 6A, FIG. 6B and FIG. 6C are flowcharts of processing for stopping a relay function request initiated by a base station according to an embodiment of the present invention
  • FIG. 7A and 7B are flowcharts showing a process of stopping a relay function request initiated by a relay station according to an embodiment of the present invention
  • 8A and 8B are flowcharts showing a process of initiating a relay function request initiated by a relay station according to an embodiment of the present invention
  • 9A and 9B are flowcharts showing a process of stopping a relay function request initiated by a relay station in an embodiment of the present invention. detailed description
  • FIG. 2 and FIG. 3 show frame structure diagrams of two kinds of communication of the wireless communication system which can be used in the present invention, but the actual system is not limited to these two frame structures.
  • only the data transmitted between the base station and the relay station is only two hops, and the data transmitted between the base station and the relay station may pass two hops in the actual application system.
  • the above multi-hop transmission but in the case of multi-hop transmission, there is no substantial change in the method of the present invention.
  • the shaded box in the figure indicates the transmitted data
  • ' The white box portion indicates the reception of data
  • the dotted box portion indicates the idle state.
  • the base station frame includes a terminal synchronization sequence, a terminal frame header, a terminal downlink subframe, a relay downlink subframe, a terminal uplink subframe, and a relay uplink subframe
  • the relay downlink subframe includes a relay frame header.
  • the terminal downlink subframe and the terminal uplink subframe are used by the base station to provide services for terminals in the coverage range, and the relay downlink subframe and the medium uplink subframe are used to provide services for the relay station under the jurisdiction of the base station.
  • the relay station frame includes a relay downlink subframe, a terminal downlink subframe, a terminal uplink subframe, and a relay uplink subframe, and the terminal downlink subframe and the terminal uplink subframe provide services for terminals in the jurisdiction of the relay station,
  • the data from the base station is received in the relay downlink subframe, and the data is transmitted to the base station in the relay uplink subframe.
  • the relay station acquires time-frequency resource allocation information of the relay downlink subframe and the relay uplink subframe by receiving the relay frame header.
  • the terminal obtains synchronization with the base station or the relay station through the terminal synchronization sequence, and obtains resource allocation information by receiving the frame header of the terminal, and provides time-frequency resource allocation information of the terminal downlink subframe and the terminal uplink subframe in the terminal frame header, so the terminal frame is only at the terminal.
  • the data is received in the downlink subframe, and the data is transmitted in the uplink subframe of the terminal, and ' does not work in the relay downlink subframe and the relay uplink subframe.
  • the frame structure is different from the frame structure shown in FIG. 2 in that the frame structure shown in FIG. 2, the relay station does not transmit the terminal synchronization sequence and the terminal frame header, and the relay station in the frame structure shown in FIG.
  • the terminal synchronization sequence and the terminal frame header are transmitted.
  • the scenario shown in Figure 2 can be applied to increase the data rate of a terminal within the coverage of the base station.
  • the relay station in this embodiment has two working modes: a relay working mode and a terminal working mode.
  • the relay station operates using the relay station frame structure, the relay station is in the relay mode; when the relay station operates using the terminal frame structure, the relay station is in the terminal mode.
  • the base station and the relay station can operate in a time division duplex mode or a frequency division half duplex mode. Time division duplex refers to the use of the same frequency for time-sharing reception and transmission.
  • Frequency division and half-duplex refers to the use of different frequencies for time-sharing reception and transmission. Due to the time division duplex and frequency division half duplex limitations of the relay station, the relay station cannot be in the terminal mode and the relay mode at the same time. After the relay station is powered on, it accesses the network in a similar manner to the ordinary terminal, and in the access process, the message parameters sent by the relay station include information that the relay station has the function of the relay station. The relay station in this embodiment can request cancellation according to the received start or stop relay function. To set its own working mode.
  • the wireless relay station After accessing the network, the wireless relay station first uses the frame structure of the terminal to operate in the mode of the ordinary terminal; after receiving the start relay function request message, the relay station starts the relay function, which uses the frame structure of the relay station to work in the relay mode. Participating in data forwarding between the base station and the mobile terminal; after receiving the stop relay function request message, the relay station sets its own working mode to the terminal mode and stops the relay function.
  • the present invention also provides a more simple relay station, which has no two working modes, only has two states of turning on and off the relay function, and after receiving the start relay function request message, starts its own Relay function; When receiving the stop relay function request message, it stops its own relay function.
  • the start relay function request message and the stop relay function request message are represented by a relay function request message, for example, a different parameter of REL_FU-REQ, wherein the format of the relay function request message is shown in Table 1. Show: Parameter length comment
  • Request mode indicates the type of the relay function request.
  • Request mode When the Request mode is ObOO, it indicates that the relay function request message is started.
  • value When the value is ObOl, it indicates that the relay function request message is stopped.
  • TLV encodings indicates the variable parameter. Encoding, each parameter consists of three fields: Type, Length, and Value. The parameters that can be included in the variable parameter encoding in the relay function request message are as shown in Table 2. These parameters are used. Set the type of relay station and the range of connections it supports:
  • the relay function response (REL_FUN-RSP) message is used to respond to the application to start or stop the relay function.
  • the format of the relay function response message is as shown in Table 3:
  • Status indicates the response to the request message to start or stop the relay function. When Status is 0x0, it indicates that the request is accepted. When Status is 0x1, it indicates the request is rejected.
  • TLV encodings are variable parameter codes.
  • the variable parameter codes in the relay function response message can include parameters as shown in Table 4. These parameters are used to set the time when the relay station switches the relay mode and allocate time-frequency resources to the relay station.
  • the time-frequency resources of the end service are included in the resources for the terminal service.
  • Both the relay station and the base station can initiate a request to start or stop the relay function of the relay station, and the base station and the relay station cooperate to complete or stop the relay station relay function.
  • the relay station and the base station negotiate to start or stop the relay function of the relay station, and then the relay station. According to the result of the negotiation, it is decided whether to set its working mode to the relay or terminal working mode.
  • FIG. 4A, 4B and 4C are process flowcharts of an embodiment of a base station initiated start relay function, wherein FIG. 4A shows a base station processing portion, FIG. 4B shows a processing portion of a relay station operating in a terminal mode, and FIG. 4C shows The processing part of the relay station working in the mode, the process specifically includes the following steps:
  • Step 400 The base station determines, when a relay station in the terminal mode starts the relay function, sends a start relay function request message to the relay station in the downlink subframe of the terminal, and allocates a time frequency resource to the relay station in the uplink subframe of the terminal. ;
  • Step 401 The base station starts a timer to wait for a response message of the relay station.
  • Step 402 The relay station working in the terminal mode receives the request for starting the relay function in the downlink subframe of the terminal.
  • Step 403 After receiving the request for starting the relay function in the downlink subframe of the terminal, the relay station working in the terminal mode determines whether the relay can be started according to the configuration information: does not start the relay function, and then proceeds to step 404. ; Start the relay function to proceed to steps 405 - 406;
  • Step 404 The relay station sends a reject request response message to the base station in the uplink subframe of the terminal, where the message includes information that the relay station refuses to start the relay function, and the message is sent in the time-frequency resource allocated by the base station, and then proceeds to step 407 ⁇ 408;
  • Steps 405-406 The relay station sends an accept request response message to the base station in the uplink subframe of the terminal, where the message includes the information that the relay station accepts the start relay function, and the message is sent in the time-frequency resource allocated by the base station, and the relay station waits in advance. After the set delay, the working mode is set to the relay mode.
  • the preset delay here can be specified by the protocol. The system defaults, and can also be given in the broadcast information sent by the base station, and then proceeds to steps 407 ⁇ 408. ;
  • Step 407 408 Before the timer overflows, the base station receives the response message in the uplink subframe of the terminal, and determines according to the type of the response message: accepting the request, determining that the relay station sets the working mode to the relay after waiting for the preset delay. Mode, the startup relay function succeeds, the process ends; if the request is rejected, the startup failure is determined, and the process ends;
  • Steps 409 ⁇ 410 if the timer expires, the base station still does not receive the response message of the relay station, the reason may be that the relay station does not receive the request message of the base station, or the base station does not receive the response message of the relay station, at this time, the base station determines Whether the number of times the start request has been sent exceeds the preset maximum number of retries: if it exceeds, it is determined that the start of the relay function fails, and the process ends; if not, the process proceeds to step 411;
  • Step 411 The base station adds 1 to the number of retries, where the number of times is used to record the number of times the relay station sends a request to start the relay function, and in order to avoid frequently sending the request, the base station waits for a period of time and then proceeds to step 412, where the period of time may be set to a random length of time, or a predetermined fixed length of time;
  • Step 412 base ⁇
  • the relay function request may be simultaneously sent to the relay station in the terminal downlink subframe and the relay downlink subframe, or may be alternately transmitted in the terminal downlink subframe and the relay downlink subframe, and at the same time, the base station is Allocating time and frequency resources to the relay station in the corresponding uplink subframe, and then entering the step
  • the base station When the timer expires, the base station still does not receive the response message from the relay station. The reason may be that the relay station does not receive the request message from the base station, or the base station does not receive the response message from the relay station. In the latter case, the relay station may have switched to the relay mode. In order to ensure that the relay station in the relay mode can receive the request message, the base station sends the start request again by transmitting both the relay downlink subframe and the terminal downlink subframe, thereby ensuring that the relay station in the relay mode can receive the request.
  • the relay station in the relay mode After receiving the request, the relay station in the relay mode, because it has completed the working mode switching, sends a request response response message to the base station in the relay uplink subframe, and the base station can determine that the relay station has been received after receiving the message. Complete the switch.
  • Steps 413 - 414 The relay station operating in the relay mode, if the request to start the relay function is received in the relay downlink subframe, since it is already in the relay mode, the relay station transmits in the relay uplink subframe. Accepting the request response message to notify the base station that the switching of the working mode is completed; Step 415: If the base station receives the accept request response message in the relay uplink subframe before the timer overflows, it is determined that the start relay function is successful, and the relay station has switched Go to relay mode and end the process.
  • FIG. 5A and FIG. 5B are process flowcharts of an embodiment of a relay-initiated trunking function, wherein FIG. 5A is a base station processing part, and FIG. 5A is a relay station processing part.
  • the process specifically includes the following steps:
  • Step 500 When the relay station in the terminal mode determines to start the relay function, sending a start relay function request message to the base station in the uplink subframe of the terminal;
  • Step 501 The relay station adds 1 to the number of retries, and the number of times is used to record the number of times the relay station sends a request to start the relay function.
  • Step 502 The relay station starts a timer, and waits for a response message from the base station.
  • Step 503 The base station receives, in the uplink subframe of the terminal, a request for the relay station to start the relay function. Step so 4 , the base station determines whether to allow the relay station to activate the relay function according to its scheduling resource situation and the relay performance information of the relay station: if yes, proceed to step 505 506; if not, proceed to step 507;
  • Step 505 506 The base station sends a request for starting a relay function in a downlink subframe of the terminal, and allocates a time frequency resource to the relay station in the uplink subframe of the terminal, and then adopts a startup relay function initiated by the base station with FIG. 4A-4C.
  • Process flow chart of the embodiment "all steps except steps 403 and 404 in steps 401 to 415 until the base station receives the response message of the relay station or the base station exceeds the maximum number of retries;
  • Step 507 The base station sends a reject request response message in the downlink subframe of the terminal.
  • Step 508 If the relay station receives the reject request response message in the downlink subframe of the terminal before the timer overflows, it is determined that the start of the relay function fails, and the process ends.
  • Steps 509 ⁇ 510 if the timer expires, the relay station still does not receive the reject request message of the base station or the request message for starting the relay function, the reason may be that the base station does not receive the request message of the relay station, or the relay station does not receive the base station.
  • the response message at this time, the relay station determines whether the number of times the start request has been sent exceeds the preset maximum number of retries: if it exceeds, it determines that the start of the relay function fails, and ends the flow; if not, it proceeds to step 511;
  • Step 511 In order to avoid frequently sending the request, the relay station waits for a period of time and then proceeds to step 500.
  • the foregoing period may be set to a random length time, or may be a preset fixed length time.
  • the relay station and the base station respectively send a start relay function request message in step 500 and steps 505-506.
  • the relay station sends the first start relay function request in step 500.
  • the message, which is sent by the base station in steps 505-506, is called a second start relay function request message.
  • FIG. 6A, 6B and 6C are process flowcharts of an embodiment of a base station initiated stop relay function, wherein FIG. 6A is a base station processing part, FIG. 6B is a processing part of a relay station in a relay mode, and FIG. 6C is a terminal.
  • the processing part of the mode relay station the process specifically includes the following steps:
  • Step 600 When the base station determines to enable a relay station in the relay mode to stop the relay function, the base station First stop forwarding data through the relay station;
  • Step 601 The base station sends a stop relay function request message to the relay station in the downlink subframe of the terminal, and allocates a time frequency resource to the relay station in the relay uplink subframe.
  • Step 602 The base station starts a timer to wait for a response message of the relay station.
  • Step 603 605 After receiving the request for stopping the relay function in the relay downlink subframe, the relay station in the relay downlink subframe transmits an accept request response message to the base station, where the message is allocated by the base station. Send in the time-frequency resource. The relay station stops the relay function, and waits for the preset delay to set its working mode to the relay mode.
  • the preset delay here may be the protocol specification, the system default, or may be specified in the base station broadcast information;
  • Step 606 If the base station receives the accept request response message in the relay uplink subframe before the timer overflows, it is determined that the stop relay function is successful, the relay station has switched to the terminal mode, and the process ends; Steps 607-608, if the timer When the timeout overflows, the base station still does not receive the response message of the relay station. The reason may be that the relay station does not receive the request message of the base station, or the base station does not receive the response message of the relay station. At this time, the base station determines whether the number of times the start request has been sent is Exceeding the preset maximum number of retries: If it is exceeded, it is determined that the stop relay function fails, and the process ends; if not, the process proceeds to step 609;
  • Step 609 the base station adds 1 to the number of retries, and the number of times is used to record the number of times the relay station sends the request to stop the relay function, and in order to avoid frequently sending the request, the base station waits for a period of time and then proceeds to step 610, where the period of time may be set to a random length of time, or a predetermined fixed length of time;
  • Step 610 The base station sends a stop relay function request to the relay station again in the terminal downlink subframe and the relay downlink subframe, where the request may be simultaneously sent to the relay station in the terminal downlink subframe and the relay downlink subframe, or may be By alternately transmitting in the terminal downlink subframe and the relay downlink subframe,
  • the base station When the timer expires, the base station still does not receive the response message from the relay station.
  • the reason may be that the relay station does not receive the request message from the base station, or the base station does not receive the response message from the relay station. In the latter case, the relay station may have switched to terminal mode.
  • the base station In order to ensure that the relay station in the terminal mode can receive the request message, the base station sends the stop request again by transmitting both the relay downlink subframe and the terminal downlink subframe, thereby ensuring that the relay station in the terminal mode can receive the request.
  • the relay station in the terminal mode After receiving the request, the relay station in the terminal mode, because it has completed the working mode switching, sends a request request response message to the base station in the terminal uplink subframe, and after receiving the message, the base station can determine that the relay station has completed the handover. .
  • step 602 the steps 611 to 612 and step 613 are further included:
  • Step 611 612 The relay station working in the terminal mode, if receiving the request to stop the relay function in the downlink subframe of the terminal, because it is already in the terminal mode, the relay station sends an accept request response message in the uplink subframe of the terminal. Notifying the base station that the switching of the working mode is completed; Step 613: If the base station receives the accept request response message in the uplink subframe of the terminal before the timer overflows, it is determined that the stopping the relay function is successful, the relay station has switched to the terminal mode, and the process ends.
  • 7A and FIG. 7B are process flowcharts of an embodiment of a relay-initiated stop-and-relay function, wherein FIG. 7A is a base station processing part, and FIG. 7B is a relay station processing part, and the flow specifically includes the following steps:
  • Step 700 When the relay station in the relay mode decides to stop the relay function, sending a stop relay function request message to the base station in the relay uplink subframe;
  • Step 701 The relay station adds 1 to the number of retries, and the number of times is used to record the number of times the relay station sends a request to stop the relay function;
  • Step 702 The relay station starts a timer, and waits for a response message from the base station.
  • Step 703 The base station receives a request for the relay station to stop the relay function in the relay uplink subframe.
  • Steps 705 - 707 the base station stops forwarding data through the relay station, and then sends a request to stop the relay function in the relay downlink subframe, and allocates time and frequency resources to the relay station in the relay uplink subframe, and then adopts FIG. 6A. - Figure 6C "Process flow of an embodiment of the base station initiated stop relay function The same steps as steps 602 to 613 until the base station receives the response message from the relay station or the base station exceeds the maximum number of retries;
  • Step 708 The base station sends a reject request response message in the relay downlink subframe, where the message includes information that the base station refuses to stop the relay function.
  • Step 709 If the relay station receives the reject request response message in the relay downlink subframe before the timer overflows, it determines that the stopping the relay function fails, and ends the process;
  • Step 710 711 If the timer expires, the relay station still does not receive the reject request message of the base station or the request message for stopping the relay function, and the reason may be that the base station does not receive the request message of the relay station, or the relay station does not receive the base station. In response to the message, at this time, the relay station determines whether it exceeds the preset maximum number of retries: if it exceeds, it determines that the stop relay function fails, and ends the flow; if not, it proceeds to step 712;
  • Step 712 In order to avoid frequently sending the request, the relay station waits for a period of time and then proceeds to step 700.
  • the foregoing period of time may be set to a random length time, or may be a preset fixed length time.
  • step 700 and step 705 the relay station and the base station respectively send a stop relay function request message.
  • the relay station in step 700 sends a message called a first stop relay function request message.
  • the second base relay function request message is sent by the base station in step 705.
  • the base station after the base station sends a start or stop relay function, if the response message of the relay station is not received and the maximum number of retries is not exceeded, the base station will be in the relay downlink subframe and the terminal downlink subframe.
  • the request message is continuously transmitted simultaneously or alternately, thereby ensuring that the relay station can receive the request in any mode, thereby ensuring the reliability of the negotiation process.
  • the request message is sent in both the downlink downlink subframe and the relay downlink subframe, and the request is sent in both the relay downlink subframe and the terminal downlink subframe in the same frame; the downlink subframe in the terminal
  • the transmission is performed alternately in the relay downlink subframe, that is, if the downlink subframe is transmitted in the terminal this time, the next time the request is resently retransmitted, it is transmitted in the relay downlink subframe.
  • the advantage of simultaneous transmission is that the delay can be reduced.
  • the disadvantage is that a certain amount of bandwidth is wasted; and alternate transmission is the opposite. For the start or stop relay function initiated by the relay station, a more simple processing flow can also be adopted.
  • FIG. 8A, 8B and 9A, 9B are respectively a process flow diagram of another embodiment of a request initiated by the relay station to start and stop the relay function, and the dotted line in the figure indicates the difference between the flow and the foregoing flow. .
  • the base station when the base station agrees with the request of the relay station, the base station does not need to send a request to start or stop the relay function to the relay station, but directly sends an accept request response message to the relay station, and the relay station receives the request. The switching of the working mode is performed after the message.
  • FIG. 8A and FIG. 8B are process flowcharts of another embodiment of the initiating relay function initiated by the relay station, wherein FIG. 8A is a base station processing part, and FIG. 8B is a relay station processing part, and the process specifically includes the following steps:
  • Step 800 When the relay station in the terminal mode decides to start the relay function, sending a start relay function request message to the base station in the uplink subframe of the terminal;
  • Step 801 The relay station adds 1 to the number of retries, and the number of times is used to record the number of times the relay station sends a request to start the relay function.
  • Step 802 The relay station starts a timer, and waits for a response message from the base station.
  • Step 803 The base station receives a request for the relay station to start the relay function in the uplink subframe of the terminal.
  • Step 804 The base station determines, according to the scheduling resource status and the relay performance information of the relay station, whether the relay station is allowed to start the relay function: 805; If not, proceed to step 806;
  • Step 805 the base station sends an accept request response message in the terminal downlink subframe, the message includes information that the base station accepts the request to initiate the relay function, and then proceeds to steps 808-809;
  • Step 806 the base station sends a reject request response message in the downlink sub-frame of the terminal, the message includes information that the base station refuses to start the relay function, and then proceeds to step 807;
  • Step 807 If the relay station receives the reject request response message in the downlink subframe of the terminal before the timer overflows, it is determined that the request to start the relay function fails, and the process ends.
  • Steps 808 ⁇ 809 if the relay station receives the accept request response message in the downlink sub-frame of the terminal before the timer overflows, wait for the preset delay, set its working mode to the relay mode, and end the process.
  • the setting may be a protocol specification, a system default, or may be specified in the base station broadcast information;
  • Steps 810 ⁇ 811 if the timer expires, the relay station still does not receive the response message of the base station, the reason may be that the base station does not receive the request message of the relay station, or the relay station does not receive the response message of the base station, at this time, the relay station judges Whether it exceeds the preset maximum number of retries: if it exceeds, it determines that the startup relay function fails, and ends the process; if not, it proceeds to step 812;
  • Step si 2 in order to avoid frequent transmission of the request, the relay station waits for a period of time and then proceeds to step 800, and the foregoing period may be set to a random length time, or may be a preset fixed length time.
  • the base station needs to allocate time frequency resources to the relay station in the uplink subframe of the terminal.
  • FIG. 9A and FIG. 9B are flowcharts of another embodiment of the relay-initiated stop-and-relay function.
  • FIG. 9A is a base station processing part
  • FIG. 9B is a relay station processing part. The process specifically includes the following steps:
  • Step 900 When the relay station in the relay mode decides to stop the relay function, sending a stop relay function request message to the base station in the relay uplink subframe;
  • Step 901 The relay station adds 1 to the number of retries, and the number of times is used to record the number of times the relay station sends a request to stop the relay function;
  • Step 902 The relay station starts a timer, and waits for a response message from the base station.
  • Step 903 The base station receives, in the relay uplink subframe, a request for the relay station to stop the relay function.
  • Step 904 the base station determines, according to its scheduling resource condition, whether the relay station is allowed to stop the relay function: if yes, the process proceeds to step 905 906; Go to step 907;
  • Steps 905 ⁇ 906 the base station stops forwarding data through the relay station, and then sends an accept request response message in the relay downlink subframe, the message includes information that the base station accepts the request to stop the relay function, and then proceeds to steps 909-910;
  • Step 907 the base station sends a reject request response message in the relay downlink subframe, the message includes information that the base station refuses to stop the relay function, and then proceeds to step 908;
  • Step 908 If the relay station receives the reject request response message in the relay downlink subframe before the timer overflows, it determines that the request fails, and ends the process; Step 909 910: If the relay station receives the accept request response message in the relay downlink subframe before the timer overflows, the relay station stops the relay function, and sets the working mode to the relay mode after waiting for the preset delay. And ending the process, where the preset may be the protocol specification, the system default, or may be specified in the base station broadcast information;
  • Step 911 912 if the timer expires, the relay station still does not receive the response message of the base station, the reason may be that the base station does not receive the request message of the relay station, or the relay station does not receive the response message of the base station, at this time, the relay station determines whether Exceeding the preset maximum number of retries: if it exceeds, it determines that the request fails, and ends the process; if not, it proceeds to step 913;
  • Step 913 in order to avoid frequently sending the request, the relay station waits for a period of time and then proceeds to step 900.
  • the foregoing period of time may be set to a random length time, or may be a preset fixed length time.
  • the base station Prior to step 900, the base station allocates time frequency resources to the relay station in the relay uplink subframe.
  • the base station modifies the state of the relay station to the terminal state, and stops forwarding through the relay station. Data to other terminals; After the base station determines that the relay function is successfully activated, the base station modifies the state of the relay station to the relay state, and according to the type of the relay station, the data transmitted by the base station to the terminal needs to be transmitted in the relay subframe.
  • the capability negotiation request or the registration request message includes a parameter for requesting to start the relay function
  • the parameter includes a request for starting the relay function, and the corresponding relay type and supported connection. Number, etc., this parameter indicates that the relay station requests to start the relay function after initial access to the network.
  • the base station on the network side determines whether the relay station is allowed to start the relay function after accessing the network, and informs the relay station in the capability negotiation response or the registration response message, and The relay station allocates a number of time-frequency resources for relay purposes. S3. After receiving the response from the base station, the relay station can determine whether it can activate the relay function after accessing the network. If allowed, the relay station switches to the relay mode at the specified time after accessing the network; otherwise, it still operates in the terminal mode, and can only initiate the application to start the relay function at a later appropriate time.
  • the invention discloses a method for starting and stopping a relay function of a wireless relay station, wherein the relay station is a digital wireless relay station or a wireless terminal having a relay function.
  • Starting or stopping the relay function can be initiated not only by the base station but also by the relay station, thereby providing convenience for the user to control the relay station it holds;
  • the timer and retry count counters are added to the process of starting or stopping the relay function, thereby ensuring the timeliness and effectiveness of information exchange;
  • the base station sends a start or stop relay function request message simultaneously (or alternately) in the relay downlink subframe and the terminal downlink subframe, thereby ensuring that the relay station can receive the request in any working mode, thereby ensuring information exchange. reliability.
  • a relay station is further provided in the embodiment of the present invention, and the relay station can set its own working mode according to the received start or stop relay function request message.
  • the relay station in the embodiment of the present invention includes: a receiving module and an executing module, where the receiving module is configured to receive a second start relay function request message or a second stop relay function request message; and the executing module is configured to receive according to the receiving The message received by the module, the operation of starting its own relay function, or the operation of stopping its own relay function.
  • the execution module includes: a first conversion unit and a second conversion unit, wherein the first conversion unit is configured to perform an operation of starting a relay function of the self, and converting the operation mode from the terminal mode to the relay mode; The two conversion unit is for performing an operation of stopping its own relay function, and converting the operation mode from the relay mode to the terminal mode.
  • the relay station further includes: an access module and a first sending module, where the access module is configured to access the relay station to which the terminal belongs to the network in the terminal mode when the device is activated; the first sending module is configured to send the network to the network side. The relay capability level and relay performance parameter information of the associated relay station.
  • the relay station further includes a second sending module, configured to send a first start relay function request message or a first stop relay function request message to the network side after accessing the network.
  • the working process of the relay station is: when the relay station starts, if it receives the start relay function request message, it starts its own relay function; if it receives the stop relay function request message, it stops its own relay function.
  • the working mode of the relay station includes a terminal mode and a relay mode
  • the startup relay function is to convert the working mode from the terminal mode to the relay mode
  • the relay function of stopping itself is to convert the working mode from the relay mode to the terminal mode. mode.
  • the relay station After the relay station starts, it accesses the network in terminal mode, and sends its own relay capability level and relay performance parameter information to the network side. After the network is connected, a message requesting the initiation of the relay function is also sent to the network side.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé destiné à amorcer et à stopper la fonction relais d'une station relais dans un système de communication sans fil, dans lequel à la fois la station relais et la station de base peuvent émettre la requête destinée à amorcer ou à stopper la fonction relais de la station relais, la station relais négocie tout d'abord avec la station de base afin d'amorcer ou de stopper la fonction relais de la station relais, puis elle détermine son mode de fonctionnement en tant que relais ou mode terminal en fonction du résultat de la négociation. Une station relais établit son propre mode de fonctionnement en fonction du message de requête reçu afin d'amorcer ou stopper la fonction relais. Elle réalise la commande à distance de l'état de fonctionnement de la station relais, et offre dans le même temps la possibilité à son utilisateur de commander la station relais qu'il possède.
PCT/CN2007/002646 2006-09-08 2007-09-04 Procédé destiné à amorcer et à stopper une fonction relais d'une station relais et station relais basée sur ce procédé WO2008043242A1 (fr)

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