CN102487294B - Relay communication method and relay station - Google Patents
Relay communication method and relay station Download PDFInfo
- Publication number
- CN102487294B CN102487294B CN201010568208.5A CN201010568208A CN102487294B CN 102487294 B CN102487294 B CN 102487294B CN 201010568208 A CN201010568208 A CN 201010568208A CN 102487294 B CN102487294 B CN 102487294B
- Authority
- CN
- China
- Prior art keywords
- frame
- relay
- relay station
- subframe
- communication
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004891 communication Methods 0.000 title claims abstract description 207
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000007774 longterm Effects 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 235000008694 Humulus lupulus Nutrition 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000005562 fading Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The invention relates to the technical field of wireless communication, and discloses a relay communication method. The relay communication method comprises the following steps that: communication is carried out by using a first kind of frame and a first communication node on a first communication link between a relay station and the first communication node by the relay station, and the first kind of the frame is an LTE (Long Term Evolution) TDD (Time Division Duplex) frame configured by an LTE system; while the communication is carried out by the relay station and the first communication node, the communication is carried out by using a second kind of the frame and the next communication node on a second communication link between the relay station and the next communication node by the relay station, and in the same frame period, the second kind of the frame is different from the first kind of the frame. The invention also discloses the relay station. According to the technical scheme disclosed by the invention, an available sub-frame resource can be increased under the condition of keeping the communication channel in the prior art in the relay communication.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a relay communication method and device.
Background
With the rapid development of wireless communication services, a new generation of mobile communication systems is required to provide all-IP high-speed packet data transmission, support high terminal mobility, support high transmission quality, provide high spectrum efficiency, and the like. In the aspect of wide area coverage, due to shadow fading and shielding of buildings, a base station in a traditional single-hop network cannot cover every place, and the coverage and capacity of the system can be improved by means of a relay technology, so that wide area continuous coverage is really realized.
In a relay network, a link between a base station and a relay station is referred to as a relay link or a backhaul link, a link between the relay station and a mobile station is referred to as an access link, and a link between the base station and the mobile station is referred to as a direct link. According to whether the relay link and the direct link share the same frequency band resource, the relay is divided into an in-band relay and an out-band relay.
For the inband Relay, the base station Relay link and the access link are time division multiplexed on a single frequency band, so there may be a handover time from a received to a received from a Relay station, and some symbols are reserved for the above handover time in the prior art, and different channels such as a Relay-Physical Downlink Control Channel (R-PDCCH), a Relay-Physical Downlink Shared Channel (R-PDSCH), a Relay-Physical Uplink Shared Channel (R-PUSCH), and a Relay-Physical Uplink Control Channel (R-PUCCH) are designed from the existing channels. However, these schemes in the prior art increase the complexity of relay link channel design and have the problem of wasting symbol resources.
Disclosure of Invention
The embodiment of the invention provides a relay communication method and a relay communication device, which can increase communication resources in relay communication.
In one aspect, an embodiment of the present invention provides a relay communication method, including: a relay station uses a first type frame to communicate with a previous hop communication node on a first communication link between the relay station and the previous hop communication node, wherein the first type frame is an LTE Time Division Duplex (TDD) frame configured by a Long Term Evolution (LTE) system; and when the relay station communicates with the previous-hop communication node, the relay station communicates with the next-hop communication node by using a second type of frame on a second communication link between the relay station and the next-hop communication node, wherein the second type of frame is different from the first type of frame in the same frame period.
On the other hand, an embodiment of the present invention further provides a relay station, including: a first communication unit, configured to communicate with a previous-hop communication node by using a first type of frame on a first communication link between the relay station and the previous-hop communication node, where the first type of frame is an LTE Time Division Duplex (TDD) frame configured by a Long Term Evolution (LTE) system; and a second communication unit, configured to communicate with the next-hop communication node by using a second type of frame on a second communication link between the relay station and the next-hop communication node while the first communication unit communicates with the previous-hop communication node, where the second type of frame is different from the first type of frame in the same frame period.
According to the scheme provided by the embodiment of the invention, in relay communication, a relay station can simultaneously transmit information to a previous-hop communication node and a next-hop communication node which are communicated with the relay station, or can simultaneously receive information transmitted by the previous-hop communication node and the next-hop communication node which are communicated with the relay station, and the available subframe resources can be increased under the condition of keeping the channel structure in the prior art.
Drawings
Fig. 1 shows a frame structure of an LTE frame of type two in an LTE system according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating transceiving in a subframe with a frame structure in a relay communication method according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a relay communication method according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating transceiving in a subframe with a frame structure in a relay communication method according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating transceiving in a subframe with a frame structure in another relay communication method according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating transceiving in a subframe with a frame structure in another relay communication method according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a relay station according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution and the object of the present invention more clear, the following description is further made with reference to the specific embodiments and the accompanying drawings.
In a Long Term Evolution (LTE) system, two types of LTE frame structures are provided, Type one (Type 1) for an LTE Frequency Division Duplex (FDD) system, and Type two (Type 2) for an LTE Time Division Duplex (TDD) system. As shown in fig. 1, is an LTE frame structure of type two. The LTE TDD frame is 10ms long and comprises 10 subframes which are subframes 0-9, the LTE TDD frame comprises 2 half frames (half-frames), each half frame is 5ms long, each half frame comprises 5 subframes, and each subframe is lms long. In 10 subframes included in one LTE TDD frame, the subframe includes a standard subframe and a special subframe, and the special subframe includes three fields (field), which are a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP), and an Uplink Pilot Time Slot (UpPTS), respectively. In the LTE TDD system, there are 7 types of Uplink/Downlink subframe configurations (Uplink/Downlink subframe configurations) in total for an LTE TDD frame, and the period switching is performed in 5ms or 10ms, respectively. As shown in table 1, the LTE TDD frame is configured by 7 uplink/downlink subframes in an LTE system, and the 7 uplink/downlink subframe configurations can be recorded as 0-6.
TABLE 1
In table 1, D indicates a subframe used for downlink transmission, that is, a subframe corresponding to the subframe number is a downlink subframe. U represents a subframe used for uplink transmission, that is, a subframe corresponding to the subframe number is an uplink subframe. S denotes a special subframe. For example, in table 1, the LTE TDD frame with an uplink/downlink subframe ratio of 1 in the LTE system is: the 0 th, 4 th, 5 th and 9 th subframes are downlink subframes, the 1 st and 6 th subframes are special subframes, and the 2 nd, 3 th, 7 th and 8 th subframes are uplink subframes; in the LTE system, an LTE TDD frame having an uplink/downlink subframe ratio of 2 is: the 0 th, 3 rd, 4 th, 5 th, 8 th and 9 th subframes are downlink subframes, the 1 st and 6 th subframes are special subframes, the 2 nd and 7 th subframes are uplink subframes, and the like, and the LTETDD frames of the uplink and downlink subframe ratios in other LTE systems can be determined according to table 1.
In the prior art, when a base station, a relay station and a user equipment communicate with each other in a frame shown in an uplink subframe configuration 1, in one subframe, only the relay station and the base station can be transmitted and received, or only the relay station and the user equipment can be transmitted and received, that is, the relay station and the base station, the relay station and the user equipment cannot be simultaneously communicated with each other, taking configuration 1 as an example, as shown in fig. 2, in a period of one LTE TDD frame, in downlink subframe 0, the base station transmits information to the relay station, and at this time, the relay station cannot simultaneously transmit information to the user equipment. In uplink subframe 2, if the ue transmits information to the relay station, the relay station cannot transmit information to the base station at this time. Therefore, in the prior art, in the same subframe, only one pair of transceiving relationships can exist among the base station, the relay station and the user equipment at the same time, which at least has the problem of resource waste, and can cause the delay of the user plane and the control plane transmission to increase.
An embodiment of the present invention provides a relay communication method, as shown in fig. 3, including:
step 301: the relay station uses a first type frame to communicate with a previous hop communication node on a first communication link between the relay station and the previous hop communication node, wherein the first type frame is an LTE TDD frame configured by an LTE system.
Step 302: and when the relay station communicates with the previous-hop communication node, the relay station communicates with the next-hop communication node by using a second type of frame on a second communication link between the relay station and the next-hop communication node, wherein the second type of frame is different from the first type of frame in the same frame period.
In the embodiment of the present invention, the second-type frames are offset from the first-type frames, that is, the second-type frames may be obtained by offsetting the first-type frames. In the embodiment of the present invention, the second type frame may be obtained by shifting the first type frame by one or more subframes, and may be shifted forward or backward in the time domain.
In the embodiment of the present invention, when the second type frame obtained after the offset of the first type frame is compared with the first type frame, the frame structure of the second type frame is the same as the frame structure of the first type frame, for example, the first type frame is an LTE TDD frame in which an uplink/downlink subframe is configured as 1 in an LTE system, that is, the frame structure of the first type frame is: the 0 th subframe is a downlink subframe, the 1 st subframe is a special subframe, the 2 nd subframe is an uplink subframe, the 3 rd subframe is an uplink subframe, the 4 th subframe is a downlink subframe, the 5 th subframe is a downlink subframe, the 6 th subframe is a special subframe, the 7 th subframe is an uplink subframe, the 8 th subframe is an uplink subframe, and the 9 th subframe is a downlink subframe. Because the second-class frame is shifted only in the time domain compared with the first-class frame, the frame structure of the second-class frame is not changed, and at this time, the structure of the second-class frame is the same as that of the first-class frame, that is: the 0 th subframe is a downlink subframe, the 1 st subframe is a special subframe, the 2 nd subframe is an uplink subframe, the 3 rd subframe is an uplink subframe, the 4 th subframe is a downlink subframe, the 5 th subframe is a downlink subframe, the 6 th subframe is a special subframe, the 7 th subframe is an uplink subframe, the 8 th subframe is an uplink subframe, and the 9 th subframe is a downlink subframe. However, in the same frame period, the second type frame is different from the first type frame, that is, in the same frame period, the subframe of the first type frame is different from the subframe of the corresponding second type frame, for example, the first type frame is an LTE TDD frame in which the uplink/downlink subframe configuration in the LTE system is 1, then in the same frame period, that is, in 10ms, the 0 th subframe of the first type frame is a downlink subframe, the 0 th subframe corresponding to the second type frame is an uplink subframe, the 1 st subframe of the first type frame is a special subframe, the subframe corresponding to the second type frame is a downlink subframe, the 2 nd subframe of the first type frame is an uplink subframe, the subframe corresponding to the second type frame is a downlink subframe, the 3 rd subframe of the first type frame is an uplink subframe, the subframe corresponding to the second type frame is a special subframe, the 4 th subframe of the first type frame is a downlink subframe, the subframe corresponding to the second type frame is an uplink subframe, the 5 th subframe of the first type frame is a downlink subframe, the subframe corresponding to the second type frame is an uplink subframe, the 6 th subframe of the first type frame is a special subframe, the subframe corresponding to the second type frame is a downlink subframe, the 7 th subframe of the first type frame is an uplink subframe, the subframe corresponding to the second type frame is a downlink subframe, the 8 th subframe of the first type frame is an uplink subframe, the subframe corresponding to the second type frame is a special subframe, the 9 th subframe of the first type frame is a downlink subframe, and the subframe corresponding to the second type frame is an uplink subframe. And by analogy, when the first type of frame is an LTE TDD frame configured by 2 or other configurations for uplink and downlink subframes in an LTE system, the second type of frame can also be determined.
In the embodiment of the present invention, the communication system may be a single-hop system, or may be a multi-hop system with two or more hops. For example, in a single-hop system, a network structure such as "base station-relay station-user equipment" may exist, the base station is a previous-hop communication node of the relay station, and the user equipment is a next-hop communication node of the relay station. In a two-hop system, a network structure such as "base station-relay station 1-relay station 2-user equipment" may exist, and for the relay station 1, the previous-hop communication node is the base station, and the next-hop communication node is the relay station 2, and for the relay station 2, the previous-hop communication node is the relay station 1, and the next-hop communication node is the user equipment. Therefore, in the embodiment of the present invention, for a relay station in a communication system, a previous-hop communication node of the relay station may be a base station or a relay station, and a next-hop communication node of the relay station may be a relay station or a user equipment, and for a relay station in a system with more than two hops, the previous-hop communication node or the next-hop communication node of the relay station may be the relay station.
In the embodiment of the present invention, in a single-hop or multi-hop system, all base stations, relay stations, and user equipments may be regarded as communication nodes. In the downlink direction, starting from the base station, going through one or more relay stations, and going to the user equipment, they may be sequentially written as the 1 st communication node, the 2 nd communication node, and going to the final nth communication node of the user equipment, where N is an integer greater than or equal to 3. For example, in a single-hop system, such as a network structure of "base station-relay station-user equipment", if a base station is the 1 st communication node, a relay station is the 2 nd communication node, and user equipment is the 3 rd communication node, the relay station is the even number of communication nodes. In a two-hop system, such as a network structure of "base station-relay station 1-relay station 2-user equipment", if the base station is the 1 st communication node, the relay station 1 is the 2 nd communication node, the relay station 2 is the 3 rd communication node, and the user equipment is the 4 th communication node, the relay station 1 is the even number communication node, and the relay station 2 is the odd number communication node. When a network structure of more than or equal to three hops exists in the communication system, the communication nodes in the system can be marked by analogy.
As shown in fig. 4, a relay communication method provided in an embodiment of the present invention is described by taking an LTE TDD frame, which is configured by uplink and downlink configuration 1 in an LTE system, as an example between a base station and a relay station in a single-hop system.
As shown in fig. 4, on a communication link between a relay station and a base station, that is, a relay link, using an LTE TDD frame with uplink and downlink configuration 1 in an LTE system, in a period of one complete frame, in a downlink subframe 0, the relay station may receive information sent by the base station; in the special subframe 1, the relay station may send information to the base station in UpPTS; in uplink subframe 2, the relay station may send information to the base station; in uplink subframe 3, the relay station may send information to the base station; in downlink subframe 4, the relay station may receive information transmitted by the base station. Since the configuration of subframes 5-9 in the frame of LTE TDD system configuration 1 is the same as the configuration of subframes 0-4, communication can be performed between the relay station and the base station as in subframes 0-4 in subframes 5-9.
On a communication link between a relay station and user equipment, namely an access link, an LTE TDD frame configured to be 1 by an LTE system may be used and shifted backward by a frame of 2 subframes, that is, subframe 0 used on the relay link corresponds to subframe 8 used on the access link, subframe 1 used on the relay link corresponds to subframe 9 used on the access link, subframe 2 used on the relay link corresponds to subframe 0 used on the access link, subframe 3 used on the relay link corresponds to subframe 1 used on the access link, subframe 4 used on the relay link corresponds to subframe 2 used on the access link, and so on, subframes 5 to 9 used on the relay link correspond to subframes 3 to 7 used on the access link, respectively. It can be seen that the frame used on the access link has the same structure including subframes 0 to 9 in one cycle as the frame used on the relay link has the same structure including subframes 0 to 9 in one cycle, and the frame used for communication on the access link is shifted backward by 2 subframes with respect to the frame used on the relay link while the relay link is communicating.
When the relay station and the base station communicate with each other, because an LTE TDD frame configured by uplink and downlink configuration 1 in an LTE system is shifted backward by a frame of 2 subframes on an access link, when the relay station receives information transmitted by the base station in a downlink subframe 0 in the relay link, the relay station can simultaneously receive information transmitted by the user equipment in an uplink subframe 8 in the access link; when the relay station sends information to the base station in the UpPTS in the special subframe 1 in the relay link, the relay station can simultaneously send information to the user equipment in the downlink subframe 9 in the access link; when the relay station sends information to the base station in the uplink subframe 2 in the relay link, the relay station can simultaneously send information to the user equipment in the downlink subframe 0 in the access link; when the relay station sends information to the base station in the uplink subframe 3 in the relay link, the relay station can simultaneously send information to the user equipment in the DwPTS of the special subframe 1 in the access link; when the relay station receives the information transmitted by the base station in the downlink subframe 4 in the relay link, the relay station can simultaneously receive the information transmitted by the user equipment in the uplink subframe 2 in the access link. The relay station may transmit information on the access link while transmitting information in the relay link subframes, or may receive information on the access link while receiving information in the relay link subframes, as in subframes 0-4.
Therefore, according to the method provided by the embodiment of the present invention, for the relay station, information may be simultaneously transmitted to the base station and the user equipment on the relay link and the access link, or information transmitted from the base station and the user equipment may be simultaneously received. For example, when using the frame configured in 1 in the LTE TDD system, the relay link and the access link can simultaneously transmit and receive in all subframes, so that the available subframe resources can be increased without changing the channel structure in the prior art, and the transmission delay of the user plane and the control plane can be shortened.
As shown in fig. 5, another relay communication method provided in the embodiment of the present invention is described by taking an LTE TDD frame between a base station and a relay station in a single-hop system, where the LTE TDD frame is configured as 2 in uplink and downlink in an LTE system.
As shown in fig. 5, on a relay link between a relay station and a base station, using an LTE TDD frame configured by an LTE system as 2, the relay station may receive information transmitted by the base station in downlink subframe 0 in one complete frame period; in the special subframe 1, the relay station may send information to the base station in UpPTS; in uplink subframe 2, the relay station may send information to the base station; in downlink subframe 3, the relay station may receive information sent by the base station; in downlink subframe 4, the relay station may receive information transmitted by the base station. Since the configuration of subframes 5-9 in the frame of LTE TDD system configuration 2 is the same as the configuration of subframes 0-4, communication can be performed between the relay station and the base station as in subframes 0-4 in subframes 5-9.
On an access link between a relay station and user equipment, a frame of which an LTE TDD frame configured by uplink and downlink as 2 in an LTE system is shifted backward by 1 subframe, that is, subframe 0 used on the relay link corresponds to subframe 9 used on the access link, subframe 1 used on the relay link corresponds to subframe 0 used on the access link, subframe 2 used on the relay link corresponds to subframe 1 used on the access link, subframe 3 used on the relay link corresponds to subframe 2 used on the access link, subframe 4 used on the relay link corresponds to subframe 3 used on the access link, and so on, subframes 5 to 9 used on the relay link correspond to subframes 4 to 8 used on the access link, respectively. It can be seen that the frame used on the access link has the same structure including subframes 0 to 9 in one cycle as the frame used on the relay link has the same structure including subframes 0 to 9 in one cycle, and the frame used for communication on the access link is shifted by 1 subframe backward in time from the frame used on the relay link while the relay link is communicating.
When the relay station and the base station communicate with each other, because the LTE TDD frame configured by uplink and downlink configuration 2 in the LTE system is used on the access link and is shifted backward by 1 subframe, when the relay station receives information transmitted by the base station in the downlink subframe 0 in the relay link, since the subframe 9 in the access link is also a downlink subframe, the user equipment can not transmit information to the relay station in the downlink subframe 9 of the access link and the relay station does not transmit information to the user equipment by scheduling; alternatively, if the base station does not transmit information to the relay station in relay link downlink subframe 0, the relay station may transmit information to the user equipment in subframe 9 in the access link, as indicated by the dashed line in fig. 5 in the same subframe, with the relay station receiving only information, or transmitting only information. The relay station sends information to the base station in the UpPTS in the relay link special subframe 1, and the relay station can simultaneously send information to the user equipment in the downlink subframe 0 in the access link. The relay station transmits information to the base station in uplink subframe 2 in the relay link, and the relay station can simultaneously transmit information to the user equipment in DwPTS in special subframe 1 in the access link. The relay station receives the information sent by the base station in the downlink subframe 3 in the relay link, and the relay station can simultaneously receive the information sent by the user equipment in the uplink subframe 2 in the access link. When the relay station receives the information sent by the base station in the downlink subframe 4 in the relay link, because the subframe 3 in the access link is also a downlink subframe, the user equipment can not send the information to the relay station in the subframe 3 of the access link through scheduling, and the relay station does not send the information to the user equipment; alternatively, if the base station does not transmit information to the relay station in relay link downlink subframe 4, the relay station may transmit information to the user equipment in subframe 3 in the access link. The relay station may transmit information on the access link while transmitting information in the relay link subframes, or may receive information on the access link while receiving information in the relay link subframes, as in subframes 0-4.
Therefore, according to the method provided by the embodiment of the present invention, for example, when using an LTE TDD frame configured by an LTE system as 2, for a relay station, information may be simultaneously transmitted to a base station and a user equipment on a relay link and a partial subframe on an access link, or information transmitted from the base station and the user equipment may be simultaneously received. The relay link and the access link can simultaneously transmit and receive in partial subframes, so that compared with the prior art, on the basis of not changing a channel structure in the prior art, the available subframe resources can be increased, and the transmission delay of a user plane and a control plane can be shortened.
As shown in fig. 6, a relay communication method in a multi-hop communication system in an embodiment of the present invention is described by taking an LTE TDD frame between a base station and a relay station in a two-hop system, where the LTE TDD frame is configured as 1 in uplink and downlink in the LTE system.
In the two-hop system provided in the embodiment of the present invention, there is a network structure of base station-relay station 1-relay station 2-user equipment, and in the downlink direction, the base station is the 1 st communication node, the relay station 1 is the 2 nd node, the relay station 2 is the 3 rd communication node, and the user equipment is the 4 th communication node, so that the relay station 1 is the even number communication node, and the relay station 2 is the odd number communication node. A relay link between the base station and the relay station 1 is referred to as a first relay link, a relay link between the relay station 1 and the relay station 2 is referred to as a second relay link, and a link between the relay station 2 and the user equipment is referred to as an access link.
As shown in fig. 6, on the first relay link, an LTE TDD frame configured by 1 in the LTE system is used, on the second relay link, a frame offset backward by 2 subframes from the LTE TDD frame configured by 1 in the LTE system in the uplink and downlink, and on the access link, a frame offset forward by 2 subframes from the frame used on the second relay link is used, in this embodiment, the access link also uses the same frame as that used on the first relay link.
In a complete frame period, subframe 0 used on the first relay link corresponds to subframe 8 used on the second relay link and subframe 0 used on the access link; subframe 1 used on the first relay link corresponds to subframe 9 used on the second relay link and subframe 1 used on the access link; subframe 2 used on the first relay link corresponds to subframe 0 used on the second relay link and subframe 2 used on the access link; subframe 3 used on the first relay link corresponds to subframe 1 used on the second relay link and subframe 3 used on the access link; subframe 4 used on the first relay link corresponds to subframe 2 used on the second relay link and subframe 1 used on the access link; by analogy, subframes 5-9 used on the first relay link correspond to subframes 3-7 used on the second relay link, and subframes 5-9 used on the access link, respectively. It can be seen that LTE TDD frames with the same structure are used in the first relay link, the second relay link, and the access link, and the LTE TDD frame used in the second relay link is shifted backward by two subframes with respect to the frames used in the first relay link and the access link.
In an LTE TDD frame with uplink and downlink configuration 1 in an LTE system, a relay station 1 may receive information sent by a base station in a downlink subframe 0 in a first relay link, and may receive information sent by a relay station 2 to the relay station 1 in an uplink subframe 8 in a second relay link; meanwhile, the relay station 2 may transmit information to the relay station 1 in the uplink subframe 8 of the second relay link and simultaneously transmit information to the user equipment in the downlink subframe 0 of the access link. The relay station 1 may transmit information to the base station in the UpPTS in the special subframe 1 of the first relay link, and at this time, in the downlink subframe of the second relay link, the relay station 1 does not transmit information to the relay station 2, the relay station 2 does not transmit information to the relay station 1, and at the same time, the relay station 2 transmits information to the user equipment in the DwPTS in the special subframe of the access link. Relay station 1 may send information to the base station in uplink subframe 2 of the first relay link, while sending information to relay station 2 in downlink subframe 0 of the second relay link; meanwhile, the relay station 2 receives the information transmitted by the relay station 1 in the downlink subframe 0 of the second relay link, and receives the information transmitted by the user equipment in the uplink subframe 2 of the access link. Relay station 1 may send information to the base station in uplink subframe 3 of the first relay link, while DwPTS sends information to relay station 2 in ad hoc subframe 1 of the second relay link; meanwhile, the relay station 2 receives the information transmitted by the relay station 1 in the DwPTS in the special subframe 3 of the second relay link, and receives the information transmitted by the user equipment in the uplink subframe 3 of the access link. The relay station 1 receives the information sent by the base station in the downlink subframe 4 of the first relay link and receives the information sent by the relay station 2 in the uplink subframe 2 of the second relay link; meanwhile, the relay station 2 transmits information to the relay station 1 in an uplink subframe 2 of the second relay link and transmits information to the user equipment in a downlink subframe 4 of the access link. By analogy, the relay station 1 may communicate with the base station in subframes 5-9 of the first relay link and simultaneously communicate with the relay station 2 in subframes 3-7 of the second relay link corresponding to subframes 5-9 of the first relay link, and simultaneously, the relay station 2 may communicate with the user equipment in subframes 5-9 of the access link corresponding to subframes 5-9 of the first relay link.
Therefore, according to the method provided by the embodiment of the present invention, in the multi-hop system, for each relay station, information may be simultaneously transmitted to the previous-hop communication node and the next-hop communication node on subframes on a relay link and an access link, or information transmitted from the previous-hop communication node and the next-hop communication node may be simultaneously received. Therefore, compared with the prior art, on the basis of not changing the channel structure in the prior art, the available subframe resources can be increased, and the transmission delay of the user plane and the control plane can be shortened.
In the relay communication method provided in the embodiment of the present invention, a single-hop system and a multi-hop system are described by taking LTE TDD frames configured by uplink and downlink in an LTE system as examples, and for frames configured by other LTE systems, relay communication may also be implemented according to the method provided in the embodiment of the present invention, which is not described herein one by one.
The embodiment of the present invention further provides a communication system, where the communication system includes a relay station, and a previous-hop communication node of the relay station and a next-hop communication node of the relay station. As shown in fig. 7, a schematic structural diagram of a relay station provided in an embodiment of the present invention includes: a first communication unit 710, configured to communicate with a previous-hop communication node by using a first type frame on a first communication link between the relay station and the previous-hop communication node, where the first type frame is an LTE tdd frame configured in an LTE system. A second communication unit 720, configured to communicate with the next-hop communication node by using a second type of frame on a second communication link between the relay station and the next-hop communication node while the first communication unit 710 communicates with the previous-hop communication node, where the second type of frame is different from the first type of frame in the same frame period.
In the embodiment of the present invention, the LTE TDD frame configured in the LTE system may be as shown in table 1 above.
In this embodiment of the present invention, the first communication unit 710 may further be configured to communicate with the last-hop communication node on the first communication link using an LTE TDD frame with an uplink-downlink configuration of 1 in an LTE system. The second communication unit 720 may further be configured to, when the relay station is an even number of communication nodes in the downlink direction, communicate with the next-hop communication node on the second communication link by using a frame that is offset backward by 2 subframes from the LTE TDD frame used by the first communication unit 710 and configured as 1 in the uplink and downlink in the LTE system; alternatively, the second communication unit 720 may be further configured to, when the relay station 710 is an odd-numbered communication node in the downlink direction, use a frame that is offset forward by 2 subframes from an LTE tdd frame configured as 1 in the uplink and downlink in the LTE system used by the first communication unit 710 on the second communication link to communicate with the next-hop communication node.
For example, in the relay station in the single-hop system in fig. 4, the first communication unit 710 in the relay station communicates with the base station on the relay link using the LTE TDD frame with uplink and downlink configuration 1 in the LTE system, and the second communication unit 720 in the relay station communicates with the user equipment on the access link using the frame with uplink and downlink configuration 1 in the LTE system and backward offset by 2 subframes. In a complete frame period, the method for the first communication unit 710 to communicate with the base station, and the method for the second communication unit 720 to communicate with the user equipment may refer to the relay communication method shown in fig. 4.
For example, in the two-hop system shown in fig. 6, there are two relay stations, namely, relay station 1 and relay station 2, the first communication unit 710 of the relay station 1 communicates with the base station using the LTE TDD frame configured as 1 in uplink and downlink in the LTE system, the second communication unit 720 of the relay station 1 communicates with the first communication unit 710 of the relay station 2 using the frame that is shifted backward by 2 subframes using the LTE TDD frame configured as 1 in uplink and downlink in the LTE system on the second relay link, and the second communication unit 720 of the relay station 2 communicates with the user terminal using the frame that is shifted forward by 2 subframes on the access link using the frame that is used on the second relay link, that is, using the same frame as that used on the first relay link. In a complete frame period, the method for the first communication unit 710 of the relay station 1 to communicate with the base station, the method for the second communication unit 720 of the relay station 1 to communicate with the first communication unit 710 of the relay station 2, and the method for the second communication unit 720 of the relay station 2 to communicate with the user equipment can be referred to the relay communication method shown in fig. 6.
In this embodiment of the present invention, the first communication unit 710 may further be configured to communicate with the last-hop communication node on the first communication link using an LTE TDD frame with uplink and downlink configuration 2 in an LTE system. The second communication unit 720 is further configured to communicate with the next-hop communication node on a second communication link by using a frame that is offset backward by 1 subframe from the LTE TDD frame with uplink and downlink configuration 2 in the LTE system used by the first communication unit 710, where the next-hop communication node may be a user equipment, and the previous-hop communication node may be a base station.
For example, in a single-hop system as shown in fig. 5, the first communication unit 710 of the relay station may communicate with the base station using the LTE TDD frame with uplink and downlink configuration 2 in the LTE system on the relay link, and the second communication unit 720 of the relay station may communicate with the user equipment using the frame shifted backward by 1 subframe from the LTE TDD frame with uplink and downlink configuration 2 in the LTE system. In a complete frame period, the method for the first communication unit 710 to communicate with the base station, and the method for the second communication unit 720 to communicate with the user equipment may refer to the relay communication method shown in fig. 5.
The communication system provided by the embodiment of the present invention may also be a system with more than or equal to three hops, and the communication method of the relay station may be analogized according to the method provided by the above embodiment.
The relay station provided in the embodiment of the present invention may also implement relay communication according to frames configured by other LTE systems, and refer to the method for configuring LTE TDD frames 1 and 2 according to uplink and downlink configurations in an LTE system provided in the above embodiment, which is not described herein.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention.
Claims (6)
1. A relay communication method, comprising:
a relay station uses a first type frame to communicate with a previous hop communication node on a first communication link between the relay station and the previous hop communication node, wherein the first type frame is an LTE Time Division Duplex (TDD) frame configured by a Long Term Evolution (LTE) system;
when the relay station communicates with the previous-hop communication node, the relay station uses a second type of frame to communicate with the next-hop communication node on a second communication link between the relay station and the next-hop communication node, and the second type of frame is different from the first type of frame in the same frame period;
if the relay station is the even number of communication nodes in the downlink direction, the second type of frame used on the second communication link is a frame of which the LTE TDD frame configured by the uplink and downlink subframes as 1 in the LTE system is shifted backwards by 2 subframes; or,
if the relay station is an odd number of communication nodes in the downlink direction, the second type of frame used on the second communication link is a frame in which an LTE TDD frame in which an uplink/downlink subframe is configured as 1 in the LTE system is shifted forward by 2 subframes.
2. The method of claim 1, wherein the second type of frame is offset from the first type of frame.
3. The method according to claim 1 or 2, wherein the first type frame is an LTE TDD frame with an uplink/downlink subframe configuration of 1 in an LTE system.
4. A relay station, comprising:
a first communication unit, configured to communicate with a previous-hop communication node by using a first type of frame on a first communication link between the relay station and the previous-hop communication node, where the first type of frame is an LTE Time Division Duplex (TDD) frame configured by a Long Term Evolution (LTE) system;
a second communication unit, configured to communicate with the next-hop communication node by using a second type of frame on a second communication link between the relay station and the next-hop communication node while the first communication unit communicates with the previous-hop communication node, where the second type of frame is different from the first type of frame in a same frame period;
the second communication unit is further configured to communicate with the next-hop communication node on the second communication link when the relay station is an even number of communication nodes in a downlink direction, and a second type of frame used for communicating with the next-hop communication node is a frame that is offset backward by 2 subframes from an LTE TDD frame in which an uplink/downlink subframe is configured as 1 in the LTE system; or,
the second communication unit is further configured to communicate with the next-hop communication node on the second communication link when the relay station is an odd-numbered communication node in the downlink direction, and a second type of frame used for communicating with the next-hop communication node is a frame shifted forward by 2 subframes from an LTE TDD frame in which an uplink-downlink subframe is configured as 1 in the LTE system.
5. The relay station according to claim 4, wherein the second communication unit is configured to communicate with the next-hop communication node on the second communication link using a second type of frame offset from the first type of frame.
6. The relay station according to claim 4 or 5, wherein the first communication unit is configured to communicate with the previous-hop communication node on a first communication link, and the first type of frame in communication with the previous-hop communication node is an LTE TDD frame with an uplink-downlink subframe configuration of 1 in an LTE system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010568208.5A CN102487294B (en) | 2010-12-01 | 2010-12-01 | Relay communication method and relay station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010568208.5A CN102487294B (en) | 2010-12-01 | 2010-12-01 | Relay communication method and relay station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102487294A CN102487294A (en) | 2012-06-06 |
| CN102487294B true CN102487294B (en) | 2014-12-10 |
Family
ID=46152751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010568208.5A Active CN102487294B (en) | 2010-12-01 | 2010-12-01 | Relay communication method and relay station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102487294B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR112015001818A2 (en) * | 2012-07-27 | 2017-08-08 | Adaptive Spectrum & Signal Alignment Inc | copper time division (tdd) duplex management system and management methods |
| CN104185282B (en) * | 2013-05-27 | 2017-12-01 | 华为技术有限公司 | Data receiving-transmitting method, via node and base station |
| CN109962761B (en) * | 2017-12-25 | 2020-09-11 | 华为技术有限公司 | Communication method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1918857A (en) * | 2003-12-31 | 2007-02-21 | 诺基亚公司 | Wireless multi-hop system with macroscopic multiplexing |
| CN101262268A (en) * | 2007-03-09 | 2008-09-10 | 大唐移动通信设备有限公司 | Method and relay device for realizing wireless link orthogonality supporting relay cellular system |
| CN101595660A (en) * | 2006-10-26 | 2009-12-02 | 诺泰网络有限公司 | The frame structure that is used for multi-hop wireless system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100871229B1 (en) * | 2007-03-06 | 2008-12-01 | 삼성전자주식회사 | Radio Over Fiber System and Signal Control Method For Executing Wireless-Communication-Service Hybrid Deplexing Technology Based |
| KR101397292B1 (en) * | 2007-08-31 | 2014-05-21 | 연세대학교 산학협력단 | System and method for transmitting/reiceiving signal in a communication system |
-
2010
- 2010-12-01 CN CN201010568208.5A patent/CN102487294B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1918857A (en) * | 2003-12-31 | 2007-02-21 | 诺基亚公司 | Wireless multi-hop system with macroscopic multiplexing |
| CN101595660A (en) * | 2006-10-26 | 2009-12-02 | 诺泰网络有限公司 | The frame structure that is used for multi-hop wireless system |
| CN101262268A (en) * | 2007-03-09 | 2008-09-10 | 大唐移动通信设备有限公司 | Method and relay device for realizing wireless link orthogonality supporting relay cellular system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102487294A (en) | 2012-06-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11751177B2 (en) | Method for slot format for backhaul and access link in wireless communication system and terminal using same method | |
| JP5020410B2 (en) | Relay station and radio communication system using the same | |
| US9621314B2 (en) | Signal transmission method using MBSFN subframe in radio communication system | |
| US7952988B2 (en) | Apparatus and method of controlling action change gap in multi-hop relay cellular network | |
| US8472357B2 (en) | System, methods, and apparatus for bidirectional relaying in wireless communications systems | |
| US9066365B2 (en) | Relay station data transmission method | |
| US8428607B2 (en) | Relays in telecommunications networks | |
| US8031604B2 (en) | Algorithm for grouping stations for transmission in a multi-phase frame structure to support multi-hop wireless broadband access communications | |
| EP2363011A1 (en) | Transferring data in a mobile telephony network | |
| WO2011098844A1 (en) | Effective ways to use a special subframe for a time division duplex relay backhaul | |
| CN101784125A (en) | Data transmission method and system in TDD mode | |
| EP2255569A1 (en) | Relays in multi-user mimo systems | |
| WO2010103048A1 (en) | A method and apparatus for use in a communication system including access nodes | |
| CN102487294B (en) | Relay communication method and relay station | |
| Castro e Souza et al. | Energy‐efficiency maximisation for cooperative and non‐cooperative OFDMA cellular networks—a survey | |
| Papadogiannis et al. | Pass it on: advanced relaying concepts and challenges for networks beyond 4G | |
| JP2011024212A (en) | Method to allocate transmission resources in cell network of cooperative type | |
| TWI444083B (en) | Wireless communication system and relay station and wireless communication device thereof | |
| Ullah | Performance analysis of resource allocation and interference mitigation methods for inband decode and forward relaying | |
| Jia et al. | A cut-through scheduling for delay optimization in TD-LTE relay enhanced networks | |
| Ab Ghafar et al. | Communications in Computer and Information Science: Techniques on Relaying for LTE-Advanced Network | |
| Jo et al. | Relay station for latency minimization and diversity enhancement | |
| Seetharaman et al. | Mitigating Performance Degradation in LTE Advance using Relaying Node |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |