CN101784125A - Data transmission method and system in TDD mode - Google Patents
Data transmission method and system in TDD mode Download PDFInfo
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Abstract
The invention discloses a data transmission method and system in TDD mode, aiming to realize the technical scheme that data is transmitted between base station and user equipment. The data transmission method in TDD mode provided by the invention comprises the following step: relay node between base station and user equipment is used to transmit the data which are sent mutually between base station and user equipment, wherein time cell used for transmitting data between base station and relay node is time cell corresponding to a pre-configured downlink mixed area or uplink mixed area; and time cell used for transmitting data between relay node and user equipment is time cell corresponding to a pre-configured downlink access area or uplink access area.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and a system for transmitting data in a Time Division Duplex (TDD) mode.
Background
At present, a frame structure in a Time Division Duplex (TDD) mode in Long Term Evolution (LTE) system specification is shown in fig. 1, where a length of each radio frame is 10 milliseconds (ms), each radio frame includes two half frames (half-frames), each half frame includes 5 subframes (subframe) of 1ms, each subframe may be divided into two common slots (slots) of 0.5ms, and each special subframe (S) includes 3 special slots, that is, a Downlink Pilot Time Slot (DwPTS, Uplink Pilot Time Slot), a guard interval (GP), and an Uplink Pilot Time Slot (UpPTS, Uplink Pilot Time Slot), where subframe 0 is necessarily a Downlink subframe, and a synchronization signal and a non-scheduled broadcast signal (e.g., MIB) are both transmitted on the subframe, and in consideration of Uplink and Downlink switching, subframe 2 is necessarily an Uplink subframe.
Two 5ms fields in a radio frame may be two same field structures as shown in fig. 1, that is, a frame structure with a period of 5ms, and the ratio configuration of uplink and downlink timeslots may be: 1 DL: 3UL, 2 DL: 2UL or 3 DL: 1 UL. Where DL denotes downlink and UL denotes downlink. In addition, in consideration of the utilization rate of radio resources and compatibility of different frame structures, two 5ms fields may also be different frame structures, only one field has a 1ms special timeslot (S), and the special timeslots in the other 5ms fields may be flexibly configured as uplink/downlink data timeslots, that is, a frame structure with a period of 10ms, and the ratio configuration of the uplink and downlink timeslots may be: 6 DL: 3UL, 7 DL: 2UL, 8 DL: 1UL or 3 DL: 5 UL. In summary, there are 7 uplink and downlink frame structure configuration types, as shown in fig. 2.
In the research of the current LTE system, a concept of a Relay Node (RN) is proposed, but since the frame structure configuration of the LTE TDD system based on the Relay Node is not clear, the data transmission of the LTE TDD system based on the Relay Node cannot be realized at present.
Disclosure of Invention
The embodiment of the invention provides a data transmission method and a data transmission system in a TDD mode, which are used for realizing the technical scheme of forwarding data between a base station and user equipment through a relay node.
The data transmission method in the TDD mode provided by the embodiment of the invention comprises the following steps:
forwarding data mutually transmitted between a base station and user equipment through a relay node between the base station and the user equipment; wherein,
the time unit for transmitting data between the base station and the relay node is a time unit corresponding to a pre-configured downlink mixed area or uplink mixed area;
the time unit for transmitting data between the relay node and the user equipment is a time unit corresponding to a pre-configured downlink access area or an uplink access area.
The communication system provided by the embodiment of the invention comprises:
the base station is used for sending data to the relay node by adopting a time unit corresponding to a preset downlink mixed area; receiving data forwarded by the relay node by adopting a time unit corresponding to a pre-configured uplink mixed region;
the relay node is used for receiving data sent by the base station and carried in a time unit corresponding to a pre-configured downlink mixed area, and forwarding the data to the user equipment by adopting the time unit corresponding to the pre-configured downlink access area; receiving data sent by user equipment carried in a time unit corresponding to a pre-configured uplink access area, and forwarding the data to a base station by adopting the time unit corresponding to the pre-configured uplink mixed area;
the user equipment is used for receiving data sent by the relay node carried in a time unit corresponding to a pre-configured downlink access area; and sending data to the relay node by adopting a time unit corresponding to a pre-configured uplink access area.
The embodiment of the invention forwards the data mutually transmitted between the base station and the user equipment through the relay node between the base station and the user equipment; the time unit for transmitting data between the base station and the relay node is a time unit corresponding to a pre-configured downlink mixed area or uplink mixed area; the time unit for transmitting data between the relay node and the user equipment is a time unit corresponding to a pre-configured downlink access area or uplink access area, so that the technical scheme of forwarding data between the base station and the user equipment through the relay node is realized.
Drawings
Fig. 1 is a diagram of a prior art LTE TDD frame structure;
fig. 2 is a schematic diagram of a configuration of an uplink and downlink frame structure in the prior art;
fig. 3 is a frame structure diagram of an LTE-a TDD system based on a relay node according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a data transmission method in TDD mode according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an LTE-ATDD frame structure based on an LTE TDD configuration 0 mode in a half-duplex mode according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an LTE-ATDD frame structure based on an LTE TDD configuration 1 mode in a half-duplex mode according to an embodiment of the present invention;
fig. 7 is a schematic diagram of another LTE-ATDD frame structure based on the LTE TDD configuration 1 mode in the half-duplex mode according to an embodiment of the present invention;
fig. 8 is a schematic diagram of an LTE-ATDD frame structure based on an LTE TDD configuration 2 mode in a half-duplex mode according to an embodiment of the present invention;
fig. 9 is a schematic diagram of an LTE-ATDD frame structure based on an LTE TDD configuration 3 mode in a half-duplex mode according to an embodiment of the present invention;
fig. 10 is a schematic diagram of an LTE-ATDD frame structure based on an LTE TDD configuration 4 mode in a half-duplex mode according to an embodiment of the present invention;
fig. 11 is a schematic diagram of an LTE-ATDD frame structure based on an LTE TDD configuration 5 mode in a half-duplex mode according to an embodiment of the present invention;
fig. 12 is a schematic diagram of an LTE-ATDD frame structure based on an LTE TDD configuration 6 mode in a half-duplex mode according to an embodiment of the present invention;
fig. 13 is a schematic diagram of an LTE-ATDD frame structure based on an LTE TDD configuration 0 mode in a full duplex mode according to an embodiment of the present invention;
fig. 14 is a schematic diagram of an LTE-ATDD frame structure based on an LTE TDD configuration 1 mode in a full duplex mode according to an embodiment of the present invention;
fig. 15 is a schematic diagram of an LTE-ATDD frame structure based on an LTE TDD configuration 2 mode in a full duplex mode according to an embodiment of the present invention;
fig. 16 is a schematic diagram of an LTE-ATDD frame structure based on an LTE TDD configuration 3 mode in a full duplex mode according to an embodiment of the present invention;
fig. 17 is a schematic diagram of an LTE-ATDD frame structure based on an LTE TDD configuration 4 mode in a full duplex mode according to an embodiment of the present invention;
fig. 18 is a schematic diagram of an LTE-ATDD frame structure based on an LTE TDD configuration 5 mode in a full duplex mode according to an embodiment of the present invention;
fig. 19 is a schematic diagram of an LTE-ATDD frame structure based on an LTE TDD configuration 6 mode in a full duplex mode according to an embodiment of the present invention;
fig. 20 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a data transmission method and a data transmission system in a TDD mode, which are used for realizing the technical scheme of forwarding data between a base station and user equipment through a relay node.
In the LTE-a system, a Relay Node (RN) is used to forward data between a base station and a user equipment, and due to the addition of the relay node, a corresponding frame structure configuration needs to be provided in a formed multi-hop cellular mobile communication network system to implement data transmission in the multi-hop cellular mobile communication network system.
The relay node can adopt a half-duplex working mode and also can adopt a full-duplex working mode of physical isolation to avoid interference, so that the relay node is divided into two schemes of half-duplex and full-duplex in the aspect of frame structure design:
in the half-duplex scheme, due to the introduction of the relay node, the wireless links of the relay node-based cellular mobile communication system are divided into three: an access link between a base station and a user equipment (eNB-Macro UE), a Relay link between a base station and a Relay node (eNB-RN), and an access link between a Relay node and a user equipment (RN-Relay UE). Considering the signal interference limitation of wireless communication, the three links need to use orthogonal wireless resources, and meanwhile, the transceiver of the Relay node is in a TDD working mode, so that the eNB-RN Relay link and the RN-Relay UE access link need to occupy different time slots in a TDD frame structure, and therefore, the access regions and the Relay regions of the RN uplink and downlink links are separated by time slots. However, the eNB-macro UE access link region and the eNB-RN relay region may coexist, because for a base station (eNB), RN is equivalent to User Equipment (UE), so in order to make full use of radio resources, the eNB-macro UE access link region and the eNB-RN relay region may coexist in a time slot as long as their time-frequency resources are orthogonal, thereby forming a mixed region. Thus, each radio half-frame structure of the Relay-based long term evolution-advanced (LTE-a) TDD frame structure has the following slot regions:
a downlink access area: and the RN transmits the data of the eNB to the UE by adopting the area.
A downlink mixed area: the eNB uses the region to send data to the RN.
An uplink access area: and the UE transmits data to the RN by adopting the area.
An uplink mixing region: and the RN adopts the region to send data to the eNB.
Special time slot (S): like the LTE TDD frame structure, it consists of DwPTS, GP and UpPTS. The DwPTS may transmit a primary synchronization signal, and may be configured as a downlink access area or a downlink hybrid area; the UpPTS may transmit an uplink synchronization signal and an uplink sounding reference signal (sounding), may be configured as an uplink access area or an uplink mixing area, and is configured to receive a signal of the UE when the UpPTS is configured as the uplink access area, but the signal cannot be forwarded to the eNB; when the UpPTS is configured as an uplink mixing region, the RN transmits a synchronization signal and sounding generated by itself to the eNB, not a signal from the UE. As shown in fig. 3, wherein TX denotes a transmission mode and RX denotes a reception mode.
In the full-duplex scheme, the RN may simultaneously transmit and receive data in each subframe, so that it is not necessary to distinguish between uplink and downlink access or a mixed region, and various configurations of the current TDD frame structure may be adopted.
Referring to fig. 4, a data transmission method in TDD mode according to an embodiment of the present invention includes:
s101, the relay node determines a time unit adopted by the base station to send data according to a preset corresponding relation between a downlink mixed area and a downlink time unit, and receives the data from the base station in the time unit.
The time unit is a subframe or a time slot, and a plurality of time units form the preset time period in the embodiment of the present invention, and the length of the preset time period may be the same as or different from the length of one radio frame.
S102, the Relay node determines a downlink time unit for forwarding data from the base station to the user equipment according to a preset corresponding relation between a downlink access area and the downlink time unit, and forwards the data from the base station to the user equipment (Relay UE) through the downlink time unit.
S103, the relay node determines an uplink time unit adopted by the user equipment to send data according to the preset corresponding relation between the uplink access area and the uplink time unit, and receives the data from the user equipment in the uplink time unit.
S104, the relay node determines an uplink time unit for forwarding data from the user equipment to the base station according to the preset corresponding relation between the uplink mixed area and the uplink time unit, and forwards the data from the user equipment to the base station through the uplink time unit.
It should be noted that the execution order of the above four steps is not fixed. In the downlink direction, step S101 and step S102 are respectively executed; in the upstream direction, step S103 and step S104 are performed, respectively. Data transmission in the uplink and downlink directions may be performed simultaneously.
Preferably, each preset time period at least includes time units respectively corresponding to the downlink access area, the downlink mixed area, the uplink access area and the uplink mixed area.
Preferably, when the base station and the ue cannot directly transmit the service data, the time unit for transmitting the synchronization signal and/or the broadcast signal in each preset time period corresponds to the downlink access area. In addition, the time unit for transmitting the synchronization signal and/or the broadcast signal in each preset time period may also correspond to the downlink mixing region.
Preferably, the preset time period is greater than or equal to a period time period of each frame and is an integer multiple of the period time period.
In the embodiment of the present invention, the periodic time periods, for example, the frame structures of the subframes 0 to 4 under the frame structure configuration 0 in fig. 2 are the same as the frame structures of the subframes 5 to 9, and are all "DSUUU", that is, the periodic time periods are a downlink subframe, a special subframe, an uplink subframe, and an uplink subframe in sequence. Therefore, the time period in which such a subframe structure is repeated is referred to as a periodic time period, for example, frame structure configuration 0 shown in fig. 2, where one periodic time period is every 5ms from subframe 0; the frame structure configuration 5 is one cycle period every 10ms from subframe 0.
The length of the preset time period in the embodiment of the present invention may be equal to or greater than the length of the periodic time period, but is an integer multiple of the periodic time period.
Preferably, the ratio of the number of time units corresponding to the downlink hybrid zone and the number of time units corresponding to the downlink access zone, or the ratio of the number of time units corresponding to the uplink hybrid zone and the number of time units corresponding to the uplink access zone in each preset time period is a ratio of the amount of data carried on a relay link between the base station and the relay node to the amount of data carried on an access link between the relay node and the user equipment.
The following describes in detail the configuration of a system frame structure under different timeslot configurations of an LTE-a TDD system frame based on a relay node according to an embodiment of the present invention.
The frame structure configuration in the half-duplex mode includes seven kinds as follows:
1. a frame structure of a 0 mode is configured based on an existing LTE TDD frame structure.
As can be seen from fig. 2, in the frame structure of configuration 0, 5ms is a switching point, and there are 1 downlink subframe (D) and 3 uplink subframes (U) in every 5 ms. Therefore, in the frame structure of the RN-based system according to the embodiment of the present invention, in addition to configuring the downlink access region, a downlink hybrid region needs to be configured, so that the frame structure of the existing configuration 0 must be extended to a frame structure of at least 10 ms.
As shown in fig. 5, a 10ms frame structure may configure a downlink access zone, a downlink hybrid zone, an uplink hybrid zone, and an uplink access zone. Preferably, the synchronization signal and the broadcast information are transmitted by the subframe 0, so the subframe 0 may be configured as a downlink access region, the subframe 5 may be configured as a downlink hybrid region, and the remaining uplink subframes may be configured as an uplink access region and an uplink hybrid region according to a proportional relationship between an amount of data carried on a relay link between the base station and the relay node and an amount of data carried on an access link between the relay node and the user equipment, that is, a ratio between a subframe corresponding to the uplink hybrid region and a subframe corresponding to the uplink access region is a ratio between an amount of data carried on the relay link between the base station and the relay node and an amount of data carried on the access link between the relay node and the user equipment.
2. A frame structure of a 1-mode is configured based on an existing LTE TDD frame structure.
As can be seen from fig. 2, in the frame structure of configuration 1, 5ms is a switching point, and there are 2 downlink subframes and 2 uplink subframes in every 5 ms. Preferably, the subframe 0 is used for carrying synchronization signals and broadcast information, and is configured as a downlink access area, and the other downlink subframe, i.e., the subframe 4, is configured as a downlink hybrid area. One of the uplink subframes, i.e., subframe 2 and subframe 3, is configured as an uplink access region, and the other is configured as an uplink hybrid region, as shown in fig. 6.
If the radio resources required by the data amount transmitted between the eNB and the RN and the data amount transmitted between the RN and the Relay UE are asymmetrical, the frame structure of the RN can be expanded to 10ms or even longer so as to ensure the proportion requirement of the data amount transmitted between the eNB and the RN and the data amount transmitted between the RN and the Relay UE. When the subframe 0 is configured as a downlink access region, the ratio of the uplink access region to the downlink access region to the uplink mixed region can be dynamically configured. As shown in fig. 7, the ratio of the number of subframes corresponding to the downlink access region to the number of subframes corresponding to the downlink hybrid region is 3: 1, and the ratio of the number of subframes corresponding to the uplink access region to the number of subframes corresponding to the uplink hybrid region is also 3: 1.
3. A frame structure of 2-mode is configured based on LTE TDD.
As shown in fig. 2, in the frame structure of LTE TDD configuration 2, 5ms is a switching point, and every 5ms has 3 downlink subframes and 1 uplink subframe. Only one subframe 2 is uplink, and only uplink access region or uplink mixed region can be configured, so at least the frame structure of LTE TDD configuration 2 needs to be extended to a frame structure with a length of 10ms, as shown in fig. 8, one of subframe 2 and subframe 7 is configured as uplink mixed region, and the other is configured as uplink access region; the subframe 0 is configured as a downlink access region, and for other downlink subframes, the subframe may be dynamically configured as a downlink access region or a downlink mixed region according to a size proportional relationship between the data amount sent by the RN to the Relay UE and the radio resource required by the data amount sent by the eNB to the RN.
4. A frame structure of 3-mode is configured based on LTE TDD.
As shown in fig. 2, in the frame structure of LTE TDD configuration 3, 10ms is a switching point, and there are 3 uplink subframes in every 10ms and 6 downlink subframes in every 10 ms. Subframe 0 and subframe 5 may carry synchronization signals and broadcast information, and are therefore configured as downlink access areas. And the other 5 downlink subframes are dynamically configured into a downlink access area and a downlink mixed area according to the requirement. The 3 uplink subframes are dynamically configured into an uplink access area and an uplink mixed area as required, and as shown in fig. 9, the ratio of the downlink access area to the downlink mixed area is 5: 1; the ratio of the uplink access area to the uplink mixed area is 2: 1.
5. A frame structure of 4-mode is configured based on LTE TDD.
As shown in fig. 2, in the frame structure of the LTE TDD configuration 4, 10ms is a switching point, and every 10ms has 7 downlink subframes and 2 uplink subframes. The subframe 0 and the subframe 5 are configured as downlink access areas, the other 5 downlink subframes are dynamically configured as a downlink access area and a downlink mixed area according to requirements, one subframe in the 2 uplink subframes is configured as an uplink access area, and the other subframe is configured as an uplink mixed area. As shown in fig. 10, the ratio of the downlink access zone to the downlink hybrid zone is 6: 1, subframe 2 is the uplink hybrid zone, and subframe 3 is the uplink access zone. If the proportion of the uplink access region and the uplink hybrid region needs to be dynamically changed, the frame structure needs to be extended to 20ms or more.
6. A frame structure of 5 mode is configured based on LTE TDD.
As shown in fig. 2, in the frame structure of the LTE TDD configuration 5, 10ms is a switching point, and each 10ms has 8 downlink subframes and 1 uplink subframe. The sub-frame 0 and the sub-frame 5 bear synchronous signals and broadcast information, so that the sub-frames are configured into a downlink access area, and the other 7 downlink sub-frames are dynamically configured into a downlink access area and a downlink mixed area according to the requirement; since there are only 1 uplink subframe in a 10ms frame, at least the frame structure of LTETDD configuration 5 needs to be extended to a 20ms frame, and one subframe is configured as an uplink access region and the other subframe is configured as an uplink hybrid region in the first 10ms and the second 10ms uplink subframes, i.e., subframe 2 and subframe 12, as shown in fig. 11, if the ratio of the uplink access region and the uplink hybrid region needs to be further changed, it needs to be further extended to a frame structure of 40ms or more.
7. A frame structure of 6 mode is configured based on LTE TDD.
As can be seen from fig. 2, in the frame structure of the LTE TDD configuration 6, 5ms is a switching point, and in the frame structure of 10ms, there are 3 downlink subframes and 5 uplink subframes. Subframe 0 and subframe 5 carry synchronization signals and broadcast information, and are therefore configured as a downlink access region, and the other downlink subframe is configured as a downlink hybrid region, as shown in fig. 12, 5 uplink subframes are dynamically configured as an uplink access region and an uplink hybrid region as needed.
In summary, the above 7 basic frame structure configurations are provided in the embodiments of the present invention, and certainly not limited to these 7 configurations, different subframes may be flexibly configured to be access areas or hybrid areas according to different channel conditions of a Relay link between a base station and a Relay node (eNB-RN) and an access link between the Relay node and a user equipment (RN-Relay UE), that is, different radio resources required by the two links to transmit the same data, and the corresponding relationships between the access areas and the hybrid areas and the subframes may be flexibly configured by further expanding the existing frame structures.
In regard to the design of the frame structure of the LTE-a TDD system based on the relay node in the full duplex mode, when the relay node is in the full duplex operating mode, the relay node may simultaneously receive a signal from a UE (or eNB) and transmit a signal to an eNB (or UE), so the frame structure design does not need to change the behaviors of the eNB and the UE, and the design is relatively simple, as shown in fig. 13 to 19, frame structure configurations of 7 TDD modes are shown.
The DwPTS in the special time slot is used for transmitting a synchronous signal and a broadcast message, and can be forwarded to the UE through the relay node; the UpPTS is used for transmitting an uplink synchronization signal and sounding, and is sent to the RN by the UE, but the RN cannot forward to the eNB, and the uplink synchronization signal and sounding sent to the eNB by the RN are generated by the RN.
The system provided by the embodiment of the invention is described below.
Referring to fig. 20, a communication system provided in an embodiment of the present invention includes a base station 11, a relay node 12, and one or more user equipments 13.
The base station 11 is configured to send data to the relay node by using a time unit corresponding to a preconfigured downlink hybrid region; and receiving the data forwarded by the relay node 12 by using a time unit corresponding to the pre-configured uplink mixed region.
The relay node 12 is configured to receive data sent by the base station 11 and carried in a time unit corresponding to a preconfigured downlink hybrid region, and forward the data to the user equipment 13 by using the time unit corresponding to the preconfigured downlink access region; and receiving data sent by the user equipment 13 carried in a time unit corresponding to the preconfigured uplink access area, and forwarding the data to the base station 11 by using the time unit corresponding to the preconfigured uplink mixed area.
The user equipment 13 is configured to receive data sent by the relay node 12 carried in a time unit corresponding to a preconfigured downlink access area; and transmitting data to the relay node 12 by adopting a time unit corresponding to the pre-configured uplink access area.
Preferably, the relay node 12 includes:
the time period configuration unit 121 is configured to store corresponding relationships between a pre-configured downlink access area, a pre-configured downlink mixed area, a pre-configured uplink access area, and a pre-configured uplink mixed area, and the time unit in each pre-configured time period.
A time unit determining unit 122, configured to determine, according to the correspondence, a time unit for the base station 11 to send data, a time unit for the user equipment 13 to forward data, a time unit for the user equipment 13 to send data, and a time unit for the base station 11 to forward data.
A transmission unit 123, configured to receive the data sent by the base station 11 by the time unit of the data sent by the base station 11 determined by the time unit determination unit 122; forwarding the data of the base station 11 to the user equipment 13 by the time unit for forwarding the data to the user equipment 13 determined by the time unit determining unit 122; receiving the data transmitted by the user equipment 13 by the time unit of the data transmitted by the user equipment 13 determined by the time unit determining unit 122; the data of the user equipment 13 is forwarded to the base station 11 by the time unit determined by the time unit determining unit 122 to forward the data to the base station 11.
Preferably, the correspondence between the downlink access area stored in the time period configuration unit 121 and the time unit in the preset time period includes a correspondence between the time unit used for transmitting the synchronization signal and the broadcast signal in the preset time period and the downlink access area. Each preset time segment includes a special time unit (which can be understood as a special subframe), and a downlink pilot time slot in the special time unit is used for transmitting a synchronization signal and a broadcast signal, so that preferably, the downlink pilot time slot corresponds to a downlink access area, and of course, the downlink pilot time slot may also correspond to a downlink hybrid area; and the uplink pilot time slot in the special time unit may correspond to an uplink access region or an uplink hybrid region.
Preferably, the base station 11 includes:
the time period configuration unit 111 is configured to store a pre-configured corresponding relationship between the downlink mixing area and the time unit in each preset time period, and a pre-configured corresponding relationship between the uplink mixing area and the time unit in each preset time period.
A time unit determining unit 112, configured to determine a time unit corresponding to a downlink mixing area to which data that needs to be sent to the relay node 12 belongs; the time unit corresponding to the uplink mixing region to which the data from the relay node 12 belongs is determined.
A transmission unit 113, configured to send data to the relay node 12 by using the time unit corresponding to the downlink mixing area determined by the time unit determination unit 112; and receiving data sent by the relay node 12 carried in the time unit corresponding to the uplink mixing region determined by the time unit determining unit 112.
Preferably, the user equipment 13 comprises:
the time period configuration unit 131 is configured to store a pre-configured corresponding relationship between the downlink access area and the time unit in each preset time period, and a pre-configured corresponding relationship between the uplink access area and the time unit in each preset time period.
A time unit determining unit 132, configured to determine a time unit corresponding to an uplink access area to which data to be sent to the relay node 12 belongs; and determining a time unit corresponding to the downlink access area to which the data from the relay node 12 belongs.
A transmission unit 133, configured to send data to the relay node 12 by using the time unit corresponding to the uplink access area determined by the time unit determination unit 132; and receiving data sent by the relay node 12 carried in the time unit corresponding to the downlink access area determined by the time unit determining unit 132.
In summary, the embodiments of the present invention provide different types of Relay frame structure configurations in half-duplex and full-duplex modes based on different types of frame structure configurations of the existing LTE TDD system in advance. Based on the data, forwarding data mutually transmitted between the base station and the user equipment through a relay node between the base station and the user equipment; the subframe used for transmitting data between the base station and the relay node is a subframe corresponding to a pre-configured downlink mixed region or an uplink mixed region; the subframe for transmitting data between the relay node and the user equipment is a subframe corresponding to a pre-configured downlink access area or uplink access area, so that the technical scheme of forwarding data between the base station and the user equipment through the relay node is realized.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (12)
1. A method for transmitting data in a Time Division Duplex (TDD) mode, the method comprising:
forwarding data mutually transmitted between a base station and user equipment through a relay node between the base station and the user equipment; wherein,
the time unit for transmitting data between the base station and the relay node is a time unit corresponding to a pre-configured downlink mixed area or uplink mixed area;
the time unit for transmitting data between the relay node and the user equipment is a time unit corresponding to a pre-configured downlink access area or an uplink access area.
2. The method of claim 1, wherein the step of the relay node forwarding data from the base station to the user equipment comprises:
the relay node determines a downlink time unit adopted by the base station to send data according to a corresponding relation between a preset downlink mixed area and the downlink time unit, and receives the data from the base station in the downlink time unit;
the relay node determines a downlink time unit for forwarding data from the base station to the user equipment according to a preset corresponding relation between a downlink access area and the downlink time unit, and forwards the data from the base station to the user equipment through the downlink time unit.
3. The method according to claim 1 or 2, wherein the step of the relay node forwarding data from the user equipment to the base station comprises:
the relay node determines an uplink time unit adopted by the user equipment to send data according to a preset corresponding relation between an uplink access area and the uplink time unit, and receives the data from the user equipment in the uplink time unit;
the relay node determines an uplink time unit for forwarding data from the user equipment to the base station according to a pre-configured corresponding relationship between the uplink mixed region and the uplink time unit, and forwards the data from the user equipment to the base station through the uplink time unit.
4. The method of claim 1, wherein each preset time period comprises at least time units corresponding to a downlink access zone, a downlink hybrid zone, an uplink access zone and an uplink hybrid zone.
5. The method according to claim 4, wherein the time unit for transmitting the synchronization signal and/or the broadcast signal in each preset time period corresponds to a downlink access area or a downlink hybrid area.
6. The method of claim 4, wherein the preset time period is greater than or equal to a period time period of each frame and is an integer multiple of the period time period.
7. The method according to claim 4, 5 or 6, wherein the ratio of the number of time units corresponding to the downlink hybrid zone to the number of time units corresponding to the downlink access zone or the ratio of the number of time units corresponding to the uplink hybrid zone to the number of time units corresponding to the uplink access zone in each preset time period is a ratio of an amount of data carried on a relay link between the base station and the relay node to an amount of data carried on an access link between the relay node and the user equipment.
8. A communication system, the system comprising:
the base station is used for sending data to the relay node by adopting a time unit corresponding to a preset downlink mixed area; receiving data forwarded by the relay node by adopting a time unit corresponding to a pre-configured uplink mixed region;
the relay node is used for receiving data sent by the base station and carried in a time unit corresponding to a pre-configured downlink mixed area, and forwarding the data to the user equipment by adopting the time unit corresponding to the pre-configured downlink access area; receiving data sent by user equipment carried in a time unit corresponding to a pre-configured uplink access area, and forwarding the data to a base station by adopting the time unit corresponding to the pre-configured uplink mixed area;
the user equipment is used for receiving data sent by the relay node carried in a time unit corresponding to a pre-configured downlink access area; and sending data to the relay node by adopting a time unit corresponding to a pre-configured uplink access area.
9. The system of claim 8, wherein the relay node comprises:
the time period configuration unit is used for storing the corresponding relations between the pre-configured downlink access area, the pre-configured downlink mixed area, the pre-configured uplink access area and the pre-configured uplink mixed area and the time unit in each preset time period;
a time unit determining unit, configured to determine, according to the correspondence, a time unit for sending data by the base station, a time unit for forwarding data to the user equipment, a time unit for sending data by the user equipment, and a time unit for forwarding data to the base station;
the transmission unit is used for receiving the data sent by the base station through the time unit of the data sent by the base station determined by the time unit determination unit; forwarding the data of the base station to the user equipment by the time unit for forwarding the data to the user equipment, which is determined by the time unit determination unit; receiving the data sent by the user equipment through the time unit of the user equipment sending data determined by the time unit determining unit; and forwarding the data of the user equipment to the base station by the time unit determined by the time unit determining unit for forwarding the data to the base station.
10. The system according to claim 9, wherein the correspondence between the downlink access area stored in the time period configuration unit and the time unit in the preset time period includes a correspondence between the time unit for transmitting the synchronization signal and the broadcast signal in the preset time period and the downlink access area.
11. The system of claim 8, wherein the base station comprises:
the time period configuration unit is used for storing the corresponding relation between the pre-configured downlink mixed region and the time unit in each preset time period and the corresponding relation between the uplink mixed region and the time unit in each frame;
a time unit determining unit, configured to determine a time unit corresponding to a downlink hybrid region to which data to be sent to a relay node belongs; determining a time unit corresponding to an uplink mixed region to which data from a relay node belongs;
a transmission unit, configured to send data to the relay node by using the time unit corresponding to the downlink mixing region determined by the time unit determination unit; and receiving data sent by the relay node carried in the time unit corresponding to the uplink mixing area determined by the time unit determining unit.
12. The system of claim 8, wherein the user equipment comprises:
the time period configuration unit is used for storing the corresponding relation between the pre-configured downlink access area and the time unit in each preset time period and the corresponding relation between the uplink access area and the time unit in each preset time period;
a time unit determining unit, configured to determine a time unit corresponding to an uplink access area to which data to be sent to a relay node belongs; determining a time unit corresponding to a downlink access area to which data from a relay node belongs;
the transmission unit is used for sending data to the relay node by adopting the time unit corresponding to the uplink access area determined by the time unit determination unit; and receiving data sent by the relay node carried in the time unit corresponding to the downlink access area determined by the time unit determining unit.
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| CN200910077216A CN101784125A (en) | 2009-01-19 | 2009-01-19 | Data transmission method and system in TDD mode |
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| CN200910077216A CN101784125A (en) | 2009-01-19 | 2009-01-19 | Data transmission method and system in TDD mode |
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