CN111464224B - Relay communication method and system - Google Patents
Relay communication method and system Download PDFInfo
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- CN111464224B CN111464224B CN202010109401.6A CN202010109401A CN111464224B CN 111464224 B CN111464224 B CN 111464224B CN 202010109401 A CN202010109401 A CN 202010109401A CN 111464224 B CN111464224 B CN 111464224B
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- 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
- H04B7/15592—Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
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Abstract
The invention discloses a relay communication method and a system, wherein the source of a frame synchronization signal is identified through identification information in the frame synchronization signal broadcasted by a base station and a relay, so that after the frame synchronization signal is received by a terminal, the source of the frame synchronization signal can be judged according to the identification information in the frame synchronization signal, and a corresponding coding modulation mode is selected to communicate with the base station or the relay, and the communication is flexible; in addition, in the frame synchronization signals of the base station and the relay broadcast, except for different identification information, the rest parts are the same, so that the method for detecting the frame synchronization signals of the base station and the relay broadcast by the terminal is the same, the frame synchronization signals can be detected at one time, the broadcast sources can be distinguished only through the identification information, and the complexity and the access time delay for detecting the frame synchronization signals are greatly reduced on the premise of meeting the flexible communication.
Description
Technical Field
The present invention belongs to the field of wireless communication technologies, and in particular, to a relay communication method and system.
Background
In communication systems, especially digital communication systems, initial time synchronization and frequency synchronization, also called frame synchronization, are key techniques. The base station broadcasts a frame synchronization signal, and the terminal acquires initial time synchronization and frequency synchronization with the base station by detecting the frame synchronization signal. Here, the synchronization mainly includes: the transmission time of the uplink signal and the downlink signal is synchronous, and the center frequency of the uplink channel and the center frequency of the downlink channel are synchronous. Through time synchronization and frequency synchronization, the terminal determines the time and frequency at which signals are transmitted and received to the base station. A communication system requires relays in addition to base stations and terminals. In many cases, because the distance between the terminal and the base station is long or the channel quality between the terminal and the base station is poor, the terminal cannot directly communicate with the base station, and a relay is needed to forward signals of the base station and the terminal to assist the communication between the base station and the terminal, so that the research of a relay communication method is of great significance.
In the conventional relay communication method, the method for processing the frame synchronization signal mainly includes: 1) the frame synchronization signals sent by the relay and the base station are not distinguished, and the relay transparently forwards the frame synchronization signals of the base station; 2) the relay and the base station transmit different frame synchronization signals. However, in the first scheme, since the terminal cannot distinguish whether the received frame synchronization signal is from the base station or the relay, the communication code modulation scheme to be relayed to the terminal must be the same as the code modulation scheme from the base station to the terminal, and the communication system and the communication method are not flexible. In the second mode, although the frame synchronization signals sent by the relay and the base station are different and can be distinguished, the terminal needs to detect the frame synchronization signal sent by the base station first due to different main contents of the frame synchronization signals sent by the relay and the base station, and then further detects the frame synchronization signal sent by the relay when the detection is unsuccessful, so that the communication complexity is high, and the access delay is greatly increased.
Disclosure of Invention
In view of the above defects or improvement requirements of the prior art, the present invention provides a relay communication method and system, which aims to solve the problem of increased access delay caused by different frame synchronization signals sent by a relay and a base station in the prior art on the premise of satisfying flexible communication.
To achieve the above object, in a first aspect, the present invention provides a relay communication method, including:
the base station and the relay respectively broadcast frame synchronization signals; the frame synchronization signal comprises identification information used for identifying the source of the frame synchronization signal; in the frame synchronization signals broadcasted by the base station and the relay, the rest parts are the same except the identification information;
after receiving the frame synchronization signal, the terminal judges the source of the frame synchronization signal according to the identification information in the frame synchronization signal, and selects a corresponding code modulation mode to communicate with the base station or the relay.
The invention has the beneficial effects that: the source of the frame synchronization signal is identified through the identification information in the frame synchronization signal broadcasted by the base station and the relay, so that the terminal can judge the source of the frame synchronization signal according to the identification information after receiving the frame synchronization signal, and a corresponding code modulation mode is selected to communicate with the base station or the relay, and the communication is flexible; in addition, in the frame synchronization signals of the base station and the relay broadcast, the rest parts are the same except for different identification information, so that the method for detecting the frame synchronization signals of the base station and the relay broadcast by the terminal is the same, the frame synchronization signals can be detected at one time, the broadcast sources can be distinguished only through the identification information, and the complexity and the access time delay for detecting the frame synchronization signals are greatly reduced on the premise of meeting flexible communication.
On the basis of the technical scheme, the invention can be further improved as follows.
Further preferably, there are multiple relays, each relay performs cascade connection, and the terminal is connected to the base station through multiple relays; dividing the relay levels from high to low according to the connection relation between the relay and the base station, wherein the relay directly connected with the base station has the highest level and the hop number reaching the base station is the least;
in the communication process, the terminal or the relay determines all the base stations, the relays and the relay levels thereof which can be directly connected by detecting the identification information in the frame synchronization signal received by the terminal or the relay.
Further preferably, if there is a directly connectable base station, the base station is directly connected; otherwise, selecting the relay with the highest level for connection.
The invention has the further beneficial effects that: when a plurality of relays exist, the relay levels are divided from high to low according to the connection relation between the relays and the base station, the terminal can distinguish which relay comes from according to the identification information in the frame synchronization signal, and when the base station capable of being directly connected exists, the base station is directly connected; otherwise, selecting the relay with the highest grade for connection so as to ensure that the terminal data packet reaches the base station with the minimum hop number and ensure that the terminal data is always forwarded towards the base station.
Further preferably, the base station broadcasts the frame synchronization signal through a plurality of antennas, the identification information of the frame synchronization signal sent by each antenna is different, and the terminal or the relay determines from which antenna of the base station the frame synchronization signal comes by detecting the identification information in the frame synchronization signal received by the terminal or the relay.
The invention has the further beneficial effects that: when the base station broadcasts the frame synchronization signal through the plurality of antennas, the terminal or the relay can distinguish which antenna of the base station the received frame synchronization signal comes from according to the identification information in the frame synchronization signal, the communication is flexible, the method for detecting the frame synchronization signal broadcasted by each antenna of the base station is the same, the frame synchronization signal can be detected once, the broadcast source can be distinguished only through the identification information, and the complexity and the access time delay for detecting the frame synchronization signal are effectively reduced.
Further preferably, the frame synchronization signal includes two identical subsynchronous signals, the subsynchronous signal broadcast by the base station is identical to the subsynchronous signal broadcast by the relay, and the two segments of the frame synchronization signal broadcast by the base station and the relay are identicalThe time difference-frequency difference of the synchronization signals are different, that is, the time difference or the frequency difference between two sub-synchronization signals in the frame synchronization signal of the base station and the relay broadcast is different, and is marked as (Δ T)R，ΔFR) Not (Δ T, Δ F); wherein, Delta TRAnd Δ FRRespectively a fixed time difference existing on the sending time and a fixed frequency difference existing on the sending frequency of two sub-synchronization signals in the frame synchronization signal of the relay broadcast, and respectively delta T and delta F are a fixed time difference existing on the sending time and a fixed frequency difference existing on the sending frequency of two sub-synchronization signals in the frame synchronization signal of the base station broadcast; the identification information is the time difference and the frequency difference of two sub-synchronization signals in the frame synchronization signal;
the terminal detects the sub-synchronization signal and the time difference and the frequency difference of the two sub-synchronization signals, judges whether an accessible base station or relay exists, obtains the time synchronization and the frequency synchronization with the relay or the base station, and selects a corresponding code modulation mode to communicate with the base station or the relay.
The invention has the further beneficial effects that: the time difference and the frequency difference of two sub-synchronous signals in the frame synchronous signal are used as identification information, the frame synchronous signal is identified to come from the base station or the relay through the time difference and the frequency difference between the two sub-synchronous signals in the frame synchronous signal broadcasted by the base station and the relay, the method is easy to detect, and under the condition of different time differences and frequency differences, the frame synchronization detection method is the same, and on the premise of meeting flexible communication, the complexity and the access time delay of detecting the frame synchronous signal are effectively reduced.
Further preferably, when there are multiple relays, the time difference-frequency difference of two segments of sub-synchronization signals in the frame synchronization signal broadcast by the relays at different levels is different, and both the time difference-frequency difference of two segments of sub-synchronization signals in the frame synchronization signal broadcast by the base station are different.
Further preferably, the frequency difference between the base station and two segments of sub-synchronization signals in the frame synchronization signals broadcasted by each stage of the relay is the same, and the time difference is different; or the time difference between the base station and two sub-synchronization signals in the frame synchronization signal broadcasted by each stage of relay is the same, and the frequency difference is different.
Further preferably, the terminal or the relay detects a sub-synchronization signal in the frame synchronization signal received by the terminal or the relay, and determines the source of the frame synchronization signal by identifying the time difference and the frequency difference of the two sub-synchronization signals, so as to identify all the base stations and relays which can be directly connected, and the level of the relays; if the base station capable of being directly connected exists, the base station is directly connected; otherwise, selecting the relay with the highest level for connection.
Further preferably, when the base station broadcasts the frame synchronization signal through the plurality of antennas, the time difference-frequency difference corresponding to the frame synchronization signal of each antenna in the base station is different and is (Δ T)1，ΔF1)、(ΔT2，ΔF2)、…、(ΔTm，ΔFm) And the time difference-frequency difference of the two sub-synchronization signals in the frame synchronization signal of the relay broadcast is not the same as that of the two sub-synchronization signals, wherein m is the number of the base station antennas.
The invention has the further beneficial effects that: when the base station broadcasts the frame synchronization signal through the plurality of antennas, the base station antenna from which the frame synchronization signal comes can be identified through the time difference and the frequency difference between two sections of sub-synchronization signals in the frame synchronization signal broadcast by each antenna of the base station, the communication is flexible, and under the condition of different time differences and frequency differences, the detection methods of the frame synchronization are the same, so that the complexity of detecting the frame synchronization signal and the access time delay are effectively reduced.
Further preferably, the frequency difference between each antenna in the base station and two segments of sub-synchronization signals in the frame synchronization signal of the relay broadcast is the same, and the time difference is different; or the time difference between each antenna in the base station and the two sub-synchronization signals in the frame synchronization signal of the relay broadcast is the same, and the frequency difference is different.
In a second aspect, the present invention provides a relay communication system, including a base station, a relay, and a terminal, the base station wirelessly communicating with the relay, and the terminal wirelessly communicating with the base station or the relay;
the base station and the relay respectively broadcast frame synchronization signals; the frame synchronization signal comprises identification information used for identifying the source of the frame synchronization signal; in the frame synchronization signals broadcasted by the base station and the relay, the rest parts are the same except the identification information;
the terminal is used for judging the source of the frame synchronization signal according to the identification information after receiving the frame synchronization signal, and selecting a corresponding code modulation mode to communicate with the base station or the relay.
The invention has the beneficial effects that: the invention can conveniently distinguish the source of the frame synchronizing signal through the identification information in the frame synchronizing signal, and the flexibility of the relay communication system is higher; besides different identification information, the rest parts of the frame synchronization signal are the same, and the method for detecting the frame synchronization signal broadcasted by the base station and the relay by the terminal is the same, so that the complexity and the access time delay for detecting the frame synchronization signal are greatly reduced on the premise of meeting the flexibility of a communication system.
Drawings
Fig. 1 is a flowchart of a relay communication method according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of broadcasting a frame synchronization signal when the number of relays is one according to embodiment 1 of the present invention;
fig. 3 is a schematic diagram of broadcasting a frame synchronization signal when the number of relays is multiple according to embodiment 1 of the present invention;
fig. 4 is a schematic diagram of a base station according to embodiment 1 of the present invention broadcasting a frame synchronization signal using multiple antennas;
fig. 5 is a schematic diagram of relay broadcast frame synchronization signals at various levels provided in embodiment 2 of the present invention;
fig. 6 is a schematic diagram of a base station according to embodiment 2 of the present invention broadcasting a frame synchronization signal by using multiple antennas.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
To achieve the above object, in a first aspect, the present invention provides a relay communication method, as shown in fig. 1, including:
the base station and the relay respectively broadcast frame synchronization signals; the frame synchronization signal comprises identification information used for identifying the source of the frame synchronization signal; in the frame synchronization signals broadcasted by the base station and the relay, the rest parts are the same except the identification information;
after receiving the frame synchronization signal, the terminal judges the source of the frame synchronization signal according to the identification information in the frame synchronization signal, and selects a corresponding code modulation mode to communicate with the base station or the relay.
For the purpose of clearly illustrating the process proposed by the present invention, the following description is made with reference to the examples:
examples 1,
A relay communication method, comprising:
after respectively embedding identification information in the frame synchronization signals broadcasted by the base station and the relay, respectively broadcasting the frame synchronization signals by the base station and the relay; specifically, the identification information is used to identify a source of the frame synchronization signal; in the frame synchronization signal broadcasted by the base station and the relay, the rest parts are the same except for the identification information, as shown in fig. 2, the identification information in the frame synchronization signal is an identification embedded therein and used for indicating that the frame synchronization signal comes from the base station or the relay;
after receiving the frame synchronization signal, the terminal judges whether the source of the frame synchronization signal is a base station or a relay according to the identification information, and selects a corresponding code modulation mode to communicate with the base station or the relay.
Preferably, there are a plurality of relays, each relay performs cascade connection, and the terminal is connected to the base station through a plurality of relays; dividing the relay levels from high to low according to the connection relation between the relays and the base station; wherein, the relay directly connected with the base station has the highest level and the hop number reaching the base station is the least; therefore, the terminal data packet is ensured to reach the base station by the minimum hop number, and the terminal data is ensured to be always forwarded to the direction of the base station.
The identification information (identification) of the frame synchronization signal of the relay broadcast also includes relay level information, which can be used to distinguish different levels of relays; in the communication process, the terminal or the relay determines all base stations, relays and relay levels thereof which can be directly connected by detecting the identification information; preferably, if there is a directly connectable base station, the base station is directly connected; otherwise, selecting the relay with the highest level for connection. Specifically, as shown in fig. 3, according to the connection relationship between the relay and the base station, the relay levels are divided from high to low, and the level information of each relay is respectively recorded as 1, 2.. multidot.n, where the relay level with level information of 1 is the highest, and is recorded as the first-level relay, and is the relay directly connected to the base station; the relay with the level information of n is the lowest level and is marked as the nth level relay, and n is the number of relays; the hop count of each relay of the level information from 1 to n to the base station is 1, 2.
Preferably, the base station broadcasts the frame synchronization signal through a plurality of antennas, the identification information of the frame synchronization signal sent by each antenna is different, and the terminal or the relay determines from which antenna of the base station the frame synchronization signal comes by detecting the identification information in the frame synchronization signal received by the terminal or the relay. As shown in fig. 4, the antennas are numbered as 1, 2, …, m, and the identification information (identification) of the frame synchronization signal broadcast by the base station further includes an antenna number of the base station, which is used to identify from which antenna of the base station the frame synchronization signal comes, where the number of transmitting antennas of the base station is m; in this embodiment, the number of antennas is 3.
The relay communication method provided by the invention respectively embeds identification information (identification) in the frame synchronizing signals of the base station and the relay broadcast to identify the source of the frame synchronizing signal, so that after the terminal receives the frame synchronizing signal, the source of the frame synchronizing signal can be judged according to the identification in the frame synchronizing signal, and a corresponding coding modulation mode is selected to communicate with the base station or the relay, and the communication is flexible; in addition, in the frame synchronization signals of the base station and the relay broadcast, the rest parts are the same except for different identification information, so that the method for detecting the frame synchronization signals of the base station and the relay broadcast by the terminal is the same, the frame synchronization signals can be detected at one time, the broadcast sources can be distinguished only through the identification information, and the complexity and the access time delay for detecting the frame synchronization signals are greatly reduced on the premise of meeting flexible communication.
Examples 2,
A relay communication method, comprising:
the base station and the relay respectively broadcast frame synchronization signals; the frame synchronization signal includes two segments of identical sub-synchronization signals, the sub-synchronization signal broadcast by the base station is identical to the sub-synchronization signal broadcast by the relay, and the time difference-frequency difference between the two segments of sub-synchronization signals in the frame synchronization signal broadcast by the base station and the relay is different, that is, the time difference or the frequency difference between the two segments of sub-synchronization signals in the frame synchronization signal broadcast by the base station and the relay is different, which is marked as (Δ T)R，ΔFR) Not (Δ T, Δ F); wherein, Delta TRAnd Δ FRRespectively a fixed time difference existing on the sending time and a fixed frequency difference existing on the sending frequency of two sub-synchronization signals in the frame synchronization signal of the relay broadcast, and respectively delta T and delta F are a fixed time difference existing on the sending time and a fixed frequency difference existing on the sending frequency of two sub-synchronization signals in the frame synchronization signal of the base station broadcast; at this time, the identification information is the time difference and the frequency difference of two sub-synchronization signals in the frame synchronization signal; specifically, taking the frame synchronization signal of the relay broadcast as an example, the sampling rate for a segment is FSConstant envelope subsynchronous signal comprising M constant envelope sampling points
Adjust it to frequency F and frequency F + delta F respectivelyRTo obtain two sub-synchronization signals, i.e. modulated sequences
And
wherein, the sequence
The first point corresponds to a transmission time T, and the sequence
The transmission time corresponding to the first point is T + delta TR(ii) a Sequence of
Combining to obtain constant-envelope frame-synchronous signal
Wherein, Δ FRIs the frequency difference, Δ T, of two sub-synchronization signalsRIs the time difference of two sub-synchronous signals, FsIn order to be able to sample the rate,
the sampling point interval of the two subsynchronous signals is shown.
The terminal detects the sub-synchronization signal and the time difference and the frequency difference of the two sub-synchronization signals, judges whether an accessible base station or relay exists, obtains the time synchronization and the frequency synchronization with the relay or the base station, and selects a corresponding code modulation mode to communicate with the base station or the relay.
Preferably, when there are multiple relays, the time difference-frequency difference of two segments of sub-synchronization signals in the frame synchronization signal broadcast by the relays at different levels is different, and both the time difference-frequency difference of two segments of sub-synchronization signals in the frame synchronization signal broadcast by the base station are different. Preferably, the frequency difference between the base station and two segments of sub-synchronization signals in the frame synchronization signal broadcasted by each stage of relay is the same, and the time difference is different; or the time difference between the base station and two sub-synchronization signals in the frame synchronization signal broadcasted by each stage of relay is the same, and the frequency difference is different. Specifically, each relay is connected in cascade, the terminal is connected to the base station through a plurality of relays, and the relay levels are divided from high to low according to the connection relationship between the relays and the base station, wherein the sub-synchronization signals of the frame synchronization signal broadcast by the relays at different levels have different time difference-frequency difference and are different from the sub-synchronization signals of the frame synchronization signal broadcast by the base station. Wherein, the relay directly connected with the base station has the highest level and the hop number reaching the base station is the least;
preferably, the terminal or the relay detects a sub-synchronization signal of the frame synchronization signal received by the terminal or the relay, and determines the source of the frame synchronization signal by identifying the time difference and the frequency difference of the sub-synchronization signal, thereby identifying all the base stations and relays which can be directly connected, and the level of the relay; preferably, if there is a directly connectable base station, the base station is directly connected; otherwise, selecting the relay with the highest level for connection; therefore, the terminal data packet is ensured to reach the base station by the minimum hop number, and the terminal data is ensured to be always forwarded to the direction of the base station.
Specifically, as shown in fig. 5, in the present embodiment, the relay 1 directly connected to the base station has 1 hop count reaching the base station, 1 level information, and the highest level, and the time difference and the frequency difference of the frame synchronization signal transmitted by the relay 1 are Δ T respectivelyR1And Δ FR1(ii) a Relay 2 of direct connection relay 1 has hop number 2 to base station, level information 2, level next to relay 1, time difference and frequency difference of transmitted frame synchronization signal being Δ TR2And Δ FR2(ii) a In the same way, the relay n connected with the relay n-1 has the hop number reaching the base station as n, the level information is next to the relay n-1, and the time difference and the frequency difference of the transmitted frame synchronization signals are respectively delta TRnAnd Δ FRn. The sub-synchronization signals of the frame synchronization signals broadcasted by the relays at different levels have different time difference-frequency difference and are different from the sub-synchronization signals of the frame synchronization signals broadcasted by the base station. Here, the time difference-frequency difference of the sub-synchronization signals of the frame synchronization signals of the relay broadcasts of different levels is expressed as (Δ T)Ri-ΔFRi) N, the difference in time difference-frequency difference indicates that the time difference or the frequency difference is different. In this embodiment, the level information of each relay with the relay level from high to low is respectively recorded as 1, 2. The terminal or the relay determines the connection relation with the relay by detecting the sub-synchronization signal of the frame synchronization signal received by the terminal or the relay. Specifically, if two frame synchronization signals can be detected, the sum of the time differences of two sub-synchronization signals of the first frame synchronization signalThe frequency differences are Δ T corresponding to the i (i ═ 1, 2.., n) th relays, respectivelyRiAnd Δ FRiThen, the time difference and the frequency difference of the two sub-synchronization signals of the 2 nd frame synchronization signal are respectively Δ T corresponding to the j (j ═ 1, 2.. multidata, n) th relayRjAnd Δ FRjWhen and i is<j, namely the first relay is higher than the second relay in level, the relay is directly connected with the first relay; according to the time and the frequency of the sub-synchronous signal of the detected first frame synchronous signal, the terminal obtains the time synchronization and the frequency synchronization with the relay, and sends the data packet to the relay, and the relay further forwards the data packet; similarly, the other relay acquires time synchronization and frequency synchronization with the relay, and transfers the packet to the relay, thereby completing the transfer of the packet.
Preferably, when the base station broadcasts the frame synchronization signal through the plurality of antennas, the time difference-frequency difference corresponding to the frame synchronization signal of each antenna in the base station is different, and is (Δ T)1，ΔF1)、(ΔT2，ΔF2)、…、(ΔTm，ΔFm) And the time difference-frequency difference of the two sub-synchronization signals in the frame synchronization signal of the relay broadcast is not the same as that of the two sub-synchronization signals, wherein m is the number of the base station antennas. Preferably, the frequency difference between each antenna in the base station and the sub-synchronization signal of the frame synchronization signal of the relay broadcast is the same, and the time difference is different; or the time difference between each antenna in the base station and the sub-synchronization signal of the frame synchronization signal broadcasted in the relay is the same, and the frequency difference is different. Specifically, as shown in fig. 6, the number of transmitting antennas of the base station is m; numbering the antennas as 1, 2, …, m respectively; setting the parameters of the antenna 1 to F1，ΔF1，T1，ΔT1Generating a frame synchronization signal for the first antenna, wherein F1And T1Respectively, the frequency and the transmission time, Δ F, of the first sub-sync signal in the frame sync signal1And Δ T1The frequency difference and the time difference of two sub-synchronization signals in the frame synchronization signal are respectively, and the number of the antennas in this embodiment is 3. Correspondingly, the parameters of the antenna 2 are set to F2，ΔF2，T2，ΔT2Generating a second antennaA frame synchronization signal; by analogy, the parameter of the antenna m is set to be Fm，ΔFm，Tm，ΔTmAnd generating a frame synchronization signal of the mth antenna. After the frame synchronization signals of all the antennas are obtained, all the antennas transmit respective frame synchronization signals at the same time.
The relay communication method provided by the invention identifies the frame synchronization signal from the base station or the relay, which relay is from which stage and which base station antenna the frame synchronization signal comes from through the time difference and the frequency difference between two sub-synchronization signals in the frame synchronization signal broadcasted by the base station and the relay.
In a second aspect, the present invention provides a relay communication system, including a base station, a relay, and a terminal, the base station wirelessly communicating with the relay, and the terminal wirelessly communicating with the base station or the relay;
the base station and the relay respectively broadcast frame synchronization signals; the frame synchronization signal comprises identification information used for identifying the source of the frame synchronization signal; in the frame synchronization signals broadcasted by the base station and the relay, the rest parts are the same except the identification information;
the terminal is used for judging the source of the frame synchronization signal according to the identification information after receiving the frame synchronization signal, and selecting a corresponding code modulation mode to communicate with the base station or the relay.
For the purpose of clarity of the system proposed by the present invention, the following description is made with reference to the following examples:
examples 3,
A relay communication system for performing the method of embodiment 1, comprising a base station, a relay, and a terminal, the base station wirelessly communicating with the relay, and the terminal wirelessly communicating with the base station or the relay;
after embedding identification information (identification) in the frame synchronization signals broadcasted by the base station and the relay respectively, the base station and the relay broadcast the frame synchronization signals respectively; wherein, the identification information is used for identifying the source of the frame synchronization signal; in the frame synchronization signals broadcasted by the base station and the relay, the rest parts are the same except the identification information;
and the terminal is used for judging whether the source of the frame synchronization signal is a base station or a relay according to the identification information after receiving the frame synchronization signal, and selecting a corresponding code modulation mode to communicate with the base station or the relay.
The relay communication system provided by the invention can conveniently distinguish the source of the frame synchronization signal (including the base station, the relay at which level and the base station antenna) by embedding the identification information (identification) in the frame synchronization signal, and has higher flexibility; besides different identification information, the rest parts of the frame synchronization signal are the same, and the method for detecting the frame synchronization signal broadcasted by the base station and the relay by the terminal is the same, so that the complexity and the access time delay for detecting the frame synchronization signal can be greatly reduced on the premise of meeting the flexibility of a communication system.
Examples 4,
A relay communication system for performing the method of embodiment 2, comprising a base station, a relay, and a terminal, the base station wirelessly communicating with the relay, and the terminal wirelessly communicating with the base station or the relay;
the base station and the relay respectively broadcast frame synchronization signals; the frame synchronization signal includes two segments of identical sub-synchronization signals, the sub-synchronization signal broadcast by the base station is identical to the sub-synchronization signal broadcast by the relay, and the time difference-frequency difference between the two segments of sub-synchronization signals in the frame synchronization signal broadcast by the base station and the relay is different, that is, the time difference or the frequency difference between the two segments of sub-synchronization signals in the frame synchronization signal broadcast by the base station and the relay is different, which is marked as (Δ T)R，ΔFR) Not (Δ T, Δ F); wherein, Delta TRAnd Δ FRRespectively being a fixed time difference existing on the sending time and a fixed frequency difference existing on the sending frequency of two sub-synchronization signals in the frame synchronization signal of the relay broadcast, and respectively being a fixed time difference existing on the sending time and a fixed frequency existing on the sending frequency of two sub-synchronization signals in the frame synchronization signal of the base station broadcastA difference; at this time, the identification information is the time difference and the frequency difference of two sub-synchronization signals in the frame synchronization signal;
the terminal detects the sub-synchronization signal and the time difference and the frequency difference of the two sub-synchronization signals, judges whether an accessible base station or relay exists, obtains the time synchronization and the frequency synchronization with the relay or the base station, and selects a corresponding code modulation mode to communicate with the base station or the relay.
The relay communication system provided by the invention distinguishes the source of the frame synchronization signal through the time difference and the frequency difference between the two sub-synchronization signals in the frame synchronization signal, the flexibility of the relay communication system is higher, the method is easy to detect, and the frame synchronization detection methods are the same under the condition of different time differences and frequency differences, so that the complexity and the access time delay of detecting the frame synchronization signal are effectively reduced on the premise of meeting the flexible communication.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A relay communication method, comprising:
the base station and the relay station broadcast frame synchronization signals respectively; the frame synchronization signal comprises identification information used for identifying the source of the frame synchronization signal; in the frame synchronization signals broadcast by the base station and the relay station, the rest parts are the same except the identification information;
after receiving the frame synchronization signal, the terminal judges the source of the frame synchronization signal according to the identification information in the frame synchronization signal, and selects a corresponding code modulation mode to communicate with the base station or the relay station;
the base station broadcasts a frame synchronization signal through a single antenna or a plurality of antennas;
when the base station broadcasts the frame synchronization signal through a plurality of antennas, the identification information of the frame synchronization signal sent by each antenna is different, and the terminal or the relay station determines which antenna of the base station the frame synchronization signal comes from by detecting the identification information in the received frame synchronization signal.
2. The relay communication method according to claim 1, wherein there are a plurality of relay stations, each relay station performs cascade connection, and the terminal is connected to the base station by forwarding through the plurality of relay stations; dividing the relay level of each relay station from high to low according to the connection relation between the relay station and the base station, wherein the level of the relay station directly connected with the base station is the highest, and the hop number reaching the base station is the least;
in the communication process, the terminal or the relay station determines all the base stations, the relay stations and the relay levels thereof which can be directly connected by detecting the identification information in the frame synchronization signal received by the terminal or the relay station.
3. The relay communication method according to any one of claims 1 to 2, wherein the frame synchronization signal comprises two identical subsynchronous signals, the subsynchronous signal broadcast by the base station is identical to the subsynchronous signal broadcast by the relay station, and the time difference-frequency difference between the two subsynchronous signals in the frame synchronization signal broadcast by the base station and the relay station is different, that is, the time difference or the frequency difference between the two subsynchronous signals in the frame synchronization signal broadcast by the base station and the relay station is different, and is denoted as (Δ T)R,ΔFR) Not (Δ T, Δ F); wherein, Delta TRAnd Δ FRRespectively being a fixed time difference existing on the sending time and a fixed frequency difference existing on the sending frequency of two sub-synchronization signals in the frame synchronization signal broadcasted by the relay station, and respectively being a fixed time difference existing on the sending time and a fixed frequency difference existing on the sending frequency of two sub-synchronization signals in the frame synchronization signal broadcasted by the base station; the identification information is the time difference and the frequency difference of two sub-synchronous signals in the frame synchronous signal;
the terminal detects the sub-synchronization signal and the time difference and the frequency difference of the two sub-synchronization signals, judges whether an accessible base station or a relay station exists, obtains the time synchronization and the frequency synchronization with the relay station or the base station, and selects a corresponding code modulation mode to communicate with the base station or the relay station.
4. The relay communication method according to claim 3, wherein when there are multiple relay stations, the time difference-frequency difference between two sub-synchronization signals in the frame synchronization signal broadcast by the relay stations of different levels is different from the time difference-frequency difference between two sub-synchronization signals in the frame synchronization signal broadcast by the base station.
5. The relay communication method according to claim 4, wherein the frequency difference between two sub-synchronization signals in the frame synchronization signal broadcast by the base station and the relay stations at each level is the same and the time difference is different; or the time difference between the two sub-synchronization signals in the frame synchronization signal broadcasted by the base station and the relay stations at each level is the same, and the frequency difference is different.
6. The relay communication method according to claim 4, wherein the terminal or the relay station detects the sub-synchronization signal in the frame synchronization signal received by the terminal or the relay station, and identifies all the base stations and the relay stations that can be directly connected, and the level of the relay station by identifying the time difference and the frequency difference between two sub-synchronization signals to determine the source of the frame synchronization signal.
7. The relay communication method according to claim 3, wherein when the base station broadcasts the frame synchronization signal via the plurality of antennas, the time difference-frequency difference corresponding to the frame synchronization signal of each antenna in the base station is different, and is (Δ T)1,ΔF1)、(ΔT2,ΔF2)、…、(ΔTm,ΔFm) And the time difference-frequency difference of the two sub-synchronization signals in the frame synchronization signal broadcasted by the relay station is not the same as the time difference-frequency difference of the two sub-synchronization signals in the frame synchronization signal broadcasted by the relay station, wherein m is the number of the base station antennas.
8. The relay communication method according to claim 7, wherein the frequency difference between each antenna in the base station and two sub-synchronization signals in the frame synchronization signal broadcast by the relay station is the same and the time difference is different; or the time difference between each antenna in the base station and the two sub-synchronization signals in the frame synchronization signal broadcasted by the relay station is the same, and the frequency difference is different.
9. A relay communication system comprising a base station, a relay station, and a terminal, wherein the base station performs wireless communication with the relay station, and the terminal performs wireless communication with the base station or the relay station;
the base station and the relay station broadcast frame synchronization signals respectively; the frame synchronization signal comprises identification information used for identifying the source of the frame synchronization signal; in the frame synchronization signals broadcast by the base station and the relay station, the rest parts are the same except the identification information;
the terminal is used for judging the source of the frame synchronization signal according to the identification information after receiving the frame synchronization signal, and selecting a corresponding code modulation mode to communicate with the base station or the relay station;
the base station broadcasts a frame synchronization signal through a single antenna or a plurality of antennas;
when the base station broadcasts the frame synchronization signal through a plurality of antennas, the identification information of the frame synchronization signal sent by each antenna is different, and the terminal or the relay station determines which antenna of the base station the frame synchronization signal comes from by detecting the identification information in the received frame synchronization signal.
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