CN101534543A - Method for transmitting data in multi-hop relaying network and relay station - Google Patents
Method for transmitting data in multi-hop relaying network and relay station Download PDFInfo
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- CN101534543A CN101534543A CN200910126325A CN200910126325A CN101534543A CN 101534543 A CN101534543 A CN 101534543A CN 200910126325 A CN200910126325 A CN 200910126325A CN 200910126325 A CN200910126325 A CN 200910126325A CN 101534543 A CN101534543 A CN 101534543A
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Abstract
The invention provides a method for transmitting data in multi-hop relaying network, after receiving the data, a relay station transmits the data which is needed to transmit after fixed transmission time delay. The invention also provides a relay station. In the method provided by the present invention, through transmitting data after fixed transmission time delay, all of the data are transmitted to user terminals after same fixed time delay, thereby avoiding intermediate data loss, data last transmitted by the station is firstly transmitted by the relay, and reaches user terminals in advance, thereby avoiding shake at data receive time.
Description
Technical field
The present invention relates to the communications field, relate more specifically to data transmission method and relay station in a kind of nontransparent centralized scheduling multi-hop relay network.
Background technology
In the multihop relay system that IEEE 802.16j standard operation group proposes, one or several relay stations (Relay Station, abbreviation RS) is set at base station (the Multi-hop RelayBase Station that supports multi-hop relay, be called for short MR-BS) and portable terminal (Mobile Stations, be called for short MS) between, by relay station the relay transmission of base station and terminal signaling is reached the expansion of coverage and the increase of power system capacity.In order to satisfy the needs of different application scene, relay station can be set to fixed relay station or mobile-relay station.According to whether producing and send prefix and control messages, relay station can be distinguished into transparent relay stations and nontransparent relay station.To support that hereinafter the base station of multi-hop relay abbreviates the base station as.In the multi-hop relay network, the dispatching difference according to relay station can be divided into centralized scheduling and distributed scheduling.In centralized scheduling, be that institute's linchpin relay station is dispatched the resource between described relay station and the lower floor's website by the base station unification; In distributed scheduling, relay station can be had jurisdiction over lower floor's website from behavior and carry out scheduling of resource.Further, in distributed scheduling, relay station may carry out scheduling of resource under the assistance of base station.
In the multi-hop relay network, from terminal through relay station, the transmission link to the base station is made of access link and repeated link at last.Wherein, access link is initial or ends at the communication link of terminal, can be the link between terminal and the base station that directly is attached thereto, also can be the link between terminal and the relay station that is attached thereto.Repeated link is link between base station and the relay station that is attached thereto or the communication link between two relay stations.
In the multi-hop relay network, the transmission method of data comprises following several: based on the transfer of data in tunnel, based on the transfer of data of CID (Connection Identifier, connection identifier (CID) and based on the transfer of data of data burst.
Under the centralized scheduling based on CID, relay station need be transmitted the data map that receives to the indicated Resource Block of the MAP message of correspondence.In data transmission procedure, if some loss of data is arranged, the data that may produce the back transmission so send the situation that data are forwarded prior to elder generation, thereby cause the consequence that Data Receiving is shaken constantly.
Summary of the invention
The technical problem to be solved in the present invention provides data transmission method and the relay station in a kind of multi-hop relay network, avoids Data Receiving to shake constantly.
In order to solve the problems of the technologies described above, the invention provides the transmission method of data in a kind of multi-hop relay network, after relay station receives data,, when fixing the forwarding, delay these data are transmitted the data that needs are transmitted.
Further, said method also can have following characteristics, and described method also comprises, the described fixedly forwarding time delay of described relay station and base station negotiate.
Further, said method also can have following characteristics, and the described fixedly forwarding time delay of described relay station and base station negotiate specifically comprises:
Described relay station sends the basic capacity request message to the base station, carries the ability information of described relay station in the described message;
Described relay station receives the relay station configuration messages that the base station sends, with the fixedly forwarding time delay value that carries in this message as described fixedly forwarding time delay.
Further, said method also can have following characteristics, and described ability information refers to the minimum value of the fixedly forwarding time delay that described relay station is supported; The fixedly forwarding time delay value that carries in the relay station configuration messages that described base station sends is not less than the minimum value of the fixedly forwarding time delay of described relay station support.
Further, said method also can have following characteristics, and described fixedly forwarding time delay is up fixedly forwarding time delay or descending fixedly forwarding time delay, and described fixedly forwarding time delay is a unit with frame or absolute time.
Further, said method also can have following characteristics, time-delay when described relay station will be adjusted fixing the forwarding sends a feedback reporting base station and adjusts described fixedly forwarding time delay, comprises the fixing time delay of transmitting in the described feedback head and prolongs or shorten indication and prolong deviator.
The present invention also proposes a kind of relay station, after described relay station is used to receive data, to the data that needs are transmitted, delays when fixing the forwarding data are transmitted.
Further, above-mentioned relay station also can have following characteristics, and described relay station also comprises the time delay negotiation element, is used for the concrete numerical value with the described fixedly forwarding time delay of base station negotiate.
Further, above-mentioned relay station also can have following characteristics, and described time delay negotiation element further comprises the transmission subelement, receives subelement, wherein,
Described transmission subelement is used to send the basic capacity request message to the base station, carries the ability information of described relay station in the described message;
Described reception subelement is used to receive the relay station configuration messages that the base station sends, with the numerical value of the fixedly forwarding time delay of carrying in this message as described fixedly forwarding time delay.
Further, above-mentioned relay station also can have following characteristics, and described ability information refers to the minimum value of the fixedly forwarding time delay that described relay station is supported; The fixedly forwarding time delay value that carries in the relay station configuration messages that described base station sends is not less than the minimum value of the fixedly forwarding time delay of described relay station support.
Further, above-mentioned relay station also can have following characteristics, described relay station also comprises the time delay adjustment unit, be used for time-delay when the fixing forwarding of needs adjustment, send a feedback reporting base station and adjust described fixedly forwarding time delay, comprise the fixing time delay of transmitting in the described feedback head and prolong or shorten indication and prolong deviator.
The method of the invention, by when fixing forwarding, delaying the forwarding data, all data all are transmitted to user terminal after fixing identical time delay, avoid occurring because intermediate data is lost, the data that send behind the base station are transmitted by relay station in advance, arrive the phenomenon of user terminal in advance, thereby avoided Data Receiving to shake constantly.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the wireless multi-hop relay network of the embodiment of the invention;
Fig. 2 is based on the data-transmission mode of CID;
Fig. 3 is the transmission method flow chart of data in the multi-hop relay network of the present invention;
Fig. 4 is the feedback schematic diagram that relay station sends to the base station.
Embodiment
Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.
With reference to figure 1, the wireless multi-hop relay network according to the embodiment of the invention is described.In the multi-hop relay network, the signal transmission between base station and the terminal is jumped via one or multi-hop relay is finished.As shown in Figure 1,1 relay station RS3 is arranged on the transmission path between base station BS and the mobile terminal MS 7,2 relay station RS1 and RS2 are arranged on the transmission path between base station BS and the mobile terminal MS 5.
With reference to figure 2, the downlink data transmission pattern based on CID is described.The base station sends downlink data at frame 1 and frame 2 to relay station; Relay station 1 will be packaged in the burst from the MS1 MAC PDUs (medium cut-in control grouping data unit) of different frame on access link and transmit; Relay station 1 will be packaged in the burst from the MAC PDUs of difference burst on repeated link and transmit; Relay station 2 can be split into the MAC PDUs of same number of frames several little bursts again and transmit.More burst is transmitted and is not provided in Fig. 2, for example little burst is packaged as a big burst and transmits, and perhaps will happen suddenly not do packing or divide processing and directly transmit.
The present invention proposes relay station and receives after the data, and the data transmission method of after fixing forwarding time delay data being transmitted as shown in Figure 3, specifically comprises:
Step 110, the fixing concrete numerical value of transmitting time delay of relay station and base station negotiate.
Need between relay station and the base station to consult the fixing ability of transmitting time delay by Signalling exchange, specific as follows:
A) relay station sends the basic capacity request message to the base station, carries the ability information of described relay station in the described request message;
Described ability information comprises the fixedly forwarding time delay of the minimum that described relay station is supported; Also whether other information support data fixed delay transfer capability such as carrying described relay station.
Reference table 1 illustrates relay station to the basic capacity request message that the base station sends, and comprises " minimum value of the fixing descending forwarding time delay that relay station is supported " or " minimum value of the fixedly forwarded upstream time delay that relay station is supported " field in the described message.
Table 1 basic capacity request message
| Type | Length | Value | The scope of application |
| 214 | 1 | The descending forwarding time delay of relay station Minimum value | The basic capability negotiating request Message |
| 215 | 1 | Relay station forwarded upstream time delay Minimum value | The basic capability negotiating request Message |
B) if the fixing time delay ability of transmitting of relay station support, the base station is the numerical value that relay station disposes described fixedly forwarding time delay by the relay station configuration messages, the numerical value of described fixedly forwarding time delay is not less than the fixedly forwarding time delay of the minimum that described relay station supports;
C) after relay station received the relay station configuration messages of base station transmission, the numerical value that uses the described fixedly forwarding time delay of carrying in this message was as the fixing time delay of transmitting, and feedback response message is confirmed to the base station.
Reference table 2 illustrates the base station to the relay station configuration messages that relay station sends, and comprises the concrete numeric field of " fixing descending forwarding time delay " or " fixedly forwarded upstream time delay " in the described message.
Table 2 relay station configuration messages
| Message name | Type | Length | Value | The scope of application |
| ... | ... | ... | ... | ... |
| The descending commentaries on classics of relay station Send out time delay | 8 | 1 | Relay station is fixing descending Transmit the numerical value of time delay | The relay station configuration disappears Breath |
| The up commentaries on classics of relay station Send out time delay | 8 | 1 | Relay station is fixing up Transmit the numerical value of time delay | The relay station configuration disappears Breath |
D) when relay station caused minimum fixing forwarding time delay to change owing to factors such as load variations, perhaps relay station need be adjusted and fix time-delay when transmitting, and can report base station adjustment by feeding back sub-head, the fixedly forwarding time delay of informing base station adjustment relay station.Carry to prolong or shorten in the described feedback head and indicate, prolong between deviator and relay station and the base station and transmit connection identifier (CID.
With reference to figure 4 and table 3, the information that relay station carries in the feedback head that the base station sends is described, described feedback head is used for informing base station and adjusts the fixedly forwarding time delay of relay station.
Table 3 a feedback formal definition table
| Feedback kind | Feedback content | Note |
| (Feedback Type) (binary system) | ||
| Feedback Type:1111 | ETI (Extend Indication): prolongation/shortening indication (1 bit) Extend Delta: time expand deviator (8 bit) CID (16 bit) | Whether elongatedness needed prolongation or shortening when the feedback head of elongatedness feedback the type sent to fixing forwardings of base station when providing data to transmit at the relay station place by relay station when relay station was transmitted.Prolongation/shortening indication: 0: prolongation indication 1: shorten indication time expand deviator: " the fixing time delay of the transmitting " deviator that needs prolongation or shorten.CID: be the transmission CID between base station and the relay station. |
Described fixedly forwarding time delay is for fixing forwarded upstream time delay or fix descending forwarding time delay, and described fixedly forwarding time delay value can be a unit with frame or absolute time.
Step 120, relay station receive after the data, to the data that needs are transmitted, after fixing forwarding time delay these data are transmitted.
The present invention also proposes a kind of relay station, after described relay station is used to receive data, to the data that needs are transmitted, delays when fixing the forwarding data are transmitted.
Described relay station also comprises the time delay negotiation element, is used for the concrete numerical value with the described fixedly forwarding time delay of base station negotiate.
Described time delay negotiation element further comprises the transmission subelement, receives subelement, wherein,
Described transmission subelement is used to send the basic capacity request message to the base station, carries the ability information of described relay station in the described message; Described ability information refers to the minimum value of the fixedly forwarding time delay that described relay station is supported;
Described reception subelement is used to receive the relay station configuration messages that the base station sends, with the numerical value of the fixedly forwarding time delay of carrying in this message as described fixedly forwarding time delay.The fixedly forwarding time delay value that carries in the relay station configuration messages that described base station sends is not less than the minimum value of the fixedly forwarding time delay of described relay station support.
Described relay station also comprises the time delay adjustment unit, is used for time-delay when forwarding is fixed in the needs adjustment, and the sub reporting base station of transmission feedback is adjusted described fixedly forwarding time delay, comprises in the sub-head of described feedback to fix to transmit time delay prolongation or shortening indication and prolongation deviator.
The above is embodiments of the invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (11)
1, the transmission method of data in a kind of multi-hop relay network is characterized in that, after relay station receives data, to the data that needs are transmitted, delays when fixing the forwarding these data are transmitted.
2, the method for claim 1 is characterized in that, described method also comprises, the described fixedly forwarding time delay of described relay station and base station negotiate.
3, the method for claim 1 is characterized in that, the described fixedly forwarding time delay of described relay station and base station negotiate specifically comprises:
Described relay station sends the basic capacity request message to the base station, carries the ability information of described relay station in the described message;
Described relay station receives the relay station configuration messages that the base station sends, with the fixedly forwarding time delay value that carries in this message as described fixedly forwarding time delay.
4, method as claimed in claim 3 is characterized in that, described ability information refers to the minimum value of the fixedly forwarding time delay that described relay station is supported; The fixedly forwarding time delay value that carries in the relay station configuration messages that described base station sends is not less than the minimum value of the fixedly forwarding time delay of described relay station support.
As the arbitrary described method of claim 1 to 4, it is characterized in that 5, described fixedly forwarding time delay is up fixedly forwarding time delay or descending fixedly forwarding time delay, described fixedly forwarding time delay is a unit with frame or absolute time.
6, as the arbitrary described method of claim 1 to 4, it is characterized in that, time-delay when described relay station will be adjusted fixing the forwarding sends a feedback reporting base station and adjusts described fixedly forwarding time delay, comprises the fixing time delay of transmitting in the described feedback head and prolongs or shorten indication and prolong deviator.
7, a kind of relay station is characterized in that, after described relay station is used to receive data, to the data that needs are transmitted, delays when fixing the forwarding data are transmitted.
8, relay station as claimed in claim 7 is characterized in that, described relay station also comprises the time delay negotiation element, is used for the concrete numerical value with the described fixedly forwarding time delay of base station negotiate.
9, relay station as claimed in claim 8 is characterized in that, described time delay negotiation element further comprises the transmission subelement, receives subelement, wherein,
Described transmission subelement is used to send the basic capacity request message to the base station, carries the ability information of described relay station in the described message;
Described reception subelement is used to receive the relay station configuration messages that the base station sends, with the numerical value of the fixedly forwarding time delay of carrying in this message as described fixedly forwarding time delay.
10, relay station as claimed in claim 9 is characterized in that, described ability information refers to the minimum value of the fixedly forwarding time delay that described relay station is supported; The fixedly forwarding time delay value that carries in the relay station configuration messages that described base station sends is not less than the minimum value of the fixedly forwarding time delay of described relay station support.
11, as claim 7 or 8 described relay stations, it is characterized in that, described relay station also comprises the time delay adjustment unit, be used for time-delay when the fixing forwarding of needs adjustment, send a feedback reporting base station and adjust described fixedly forwarding time delay, comprise the fixing time delay of transmitting in the described feedback head and prolong or shorten indication and prolong deviator.
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| CN101237278A (en) * | 2007-01-30 | 2008-08-06 | 西门子通信技术（北京）有限公司 | Method, system, relay station and base station for transmitting data in mobile communication |
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Patent Citations (4)
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| US20050089057A1 (en) * | 2003-10-27 | 2005-04-28 | Samsung Electronics Co., Ltd. | Ad-hoc network wireless communication system and method thereof |
| CN101009633A (en) * | 2006-01-27 | 2007-08-01 | 华为技术有限公司 | A data transfer method and transfer system with the route information |
| CN101237278A (en) * | 2007-01-30 | 2008-08-06 | 西门子通信技术（北京）有限公司 | Method, system, relay station and base station for transmitting data in mobile communication |
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Application publication date: 20090916 |