CN101384075A - Relay dedicated downlink channel and allocation method thereof - Google Patents
Relay dedicated downlink channel and allocation method thereof Download PDFInfo
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- CN101384075A CN101384075A CNA2007101460267A CN200710146026A CN101384075A CN 101384075 A CN101384075 A CN 101384075A CN A2007101460267 A CNA2007101460267 A CN A2007101460267A CN 200710146026 A CN200710146026 A CN 200710146026A CN 101384075 A CN101384075 A CN 101384075A
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Abstract
The invention provides a distribution method of a special down channel of a relay station. When the relay station completes the network insertion and initialization, a base station can actively distribute the special down channel for the relay station, or the relay station can ask the base station to distribute the special down channel for the relay station. Through the invention, in multiple hop junction networks, when a terminal performs the period ranging, the relay station does not need to apply for down bandwidth used for transferring control signaling to the terminal from the base station, thereby time delay and resource waste which are caused in the information alternation process are saved.
Description
Technical field
The present invention relates to the communications field, particularly, relate to relay station dedicated downlink channel and distribution method thereof, it is particularly useful for nontransparent centralized scheduling multi-hop relay network.
Background technology
As shown in Figure 1, 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 Relay Base 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 divided into transparent relay stations and nontransparent relay station.Hereinafter, will support the base station of multi-hop relay to abbreviate the base station as.
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 centralized scheduling, the base station unification is for the access link of multi-hop relay sub-district and repeated link Resources allocation and produce corresponding M AP (mapping), is perhaps produced the MAP of oneself according to the indication information of base station by relay station.In distributed scheduling, the resource allocation of base station and relay station difference determinant relay station or terminal, and produce corresponding M AP.
Under the nontransparent situation of in IEEE 802.16j_D1 document, stipulating, comprise a sub-frame of uplink and a descending sub frame in the frame structure of base station and relay station respectively, and each sub-frame of uplink and each descending sub frame insert zone (Access Zone) by one respectively and a relaying zone (Relay Zone) constitutes.Wherein, Access Zone is used for the transmission of access link, and Relay Zone is used for the transmission of repeated link.R-MAP (Relay-MAP, relaying mapping) message is meant the MAP message that is sent at Relay Zone by base station or relay station.
IEEE 802.16j_D1 document is that the situation of nontransparent centralized scheduling has designed the R-MAP IE of " RS_BW-ALLOC IE " by name, to be used to be transmitted in the control messages between relay station and the terminal, for example RNG-RSP (range finding-answer message), MOB_NBR-ADV (Neighbor Advertisement), DCD (down channel describing message) and UCD (up channel describing message) to the relay station Resources allocation.
Particularly, Fig. 1 shows the flow chart of terminal periodic range finding (ranging) in the existing nontransparent centralized scheduling multi-hop relay network that defines in IEEE 802.16j_D1 document, wherein, cycle ranging originates in terminal at specific cycle ranging CDMA sign indicating number of selecting at random of up zone transmission.After relay station was received, the local RNG-RSP that sends was to terminal.Wherein, the downlink bandwidth that sends RNG-RSP need be applied for to the base station by RS BR header.Base station feedback RS_DL_MAP-IE distributes to the downlink bandwidth of relay station with indication.As shown in Figure 1, in whole flow process, each relay station sends before the RNG-RSP to terminal, all will apply for downlink bandwidth (in Fig. 1, the with dashed lines arrow illustrates) to the base station by RS BR header.
As mentioned above, under nontransparent centralized scheduling situation, utilize such scheme, each relay station all will be applied for downlink bandwidth to the base station to before the terminal transmission control signaling, and this has just caused end to end that interacting message can produce very big time delay and resource overhead.
Summary of the invention
At this problem, the present invention proposes the dedicated downlink channel allocative decision of relay station.
According to the present invention, a kind of distribution method of relay station dedicated downlink channel is provided, this method is used for the multi-hop relay network of nontransparent centralized scheduling, above-mentioned multi-hop relay network comprises base station, relay station and terminal, in the method, when relay station was finished network insertion and initialization, the base station was that relay station distributes dedicated downlink channel.
Wherein, the base station is that to distribute cell be that RS-DL_DCH assignment IE is that relay station distributes dedicated downlink channel for relay station downlink dedicated channels among the R-MAP by relay map message.
In addition, the dedicated downlink channel of base station assigns can transmit a message signaling at least, the each dedicated downlink channel that distributes in base station is effective in N frame, and can upgrade according to the demand of traffic load, wherein, the demand of traffic load can periodically be calculated or be calculated after Event triggered by relay station.
Like this, when the terminal cycle of carrying out found range, relay station used the dedicated downlink channel of base station assigns to control signaling to terminal transmission.
According to the present invention, the distribution method of another kind of relay station dedicated downlink channel also is provided, the multi-hop relay network that is used for nontransparent centralized scheduling, above-mentioned multi-hop relay network comprises base station, relay station and terminal, in the method, when relay station is finished network insertion and initialization, relay station request base station assigns dedicated downlink channel.
Wherein, relay station is RS-DL_DCH request header by sending relay station downlink dedicated channels request header to the base station, request base station assigns dedicated downlink channel.In response to the request of relay station, the base station is that relay station distributes dedicated downlink channel by the RS-DL_DCH assignment IE among the R-MAP.
In addition, the dedicated downlink channel of base station assigns can transmit a message signaling at least, the each dedicated downlink channel that distributes in base station is effective in N frame, and can upgrade according to the demand of traffic load, wherein, the demand of traffic load can periodically be calculated or be calculated after Event triggered by relay station.
Like this, when the terminal cycle of carrying out found range, relay station used the dedicated downlink channel of base station assigns to control signaling to terminal transmission.
According to the present invention, a kind of relay station dedicated downlink channel also is provided, the multi-hop relay network that is used for nontransparent centralized scheduling, this multi-hop relay network comprises base station, relay station and terminal, wherein, relay station uses this dedicated downlink channel to control signaling to terminal transmission, and this dedicated downlink channel can initiatively be distributed by the base station when relay station is finished network insertion and initialization, perhaps when relay station is finished network insertion and initialization by relay station request base station assigns.
By the present invention, in the multi-hop relay network, when terminal was carried out cycle ranging, relay station no longer needed to apply for being used for controlling to terminal transmission the downlink bandwidth of signaling to the base station, thereby has saved the time delay and the wasting of resources that message interaction process causes.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart of terminal periodic ranging in the existing nontransparent centralized scheduling multi-hop relay network in the IEEE 802.16j_D1 document;
Fig. 2 is the schematic diagram that is used to implement wireless multi-hop relay network of the present invention;
Fig. 3 utilizes relay station private downlink resource to carry out the flow chart of terminal periodic ranging in the nontransparent centralized scheduling multi-hop relay network according to the embodiment of the invention;
Fig. 4 is the message format schematic diagram of RS-DL_DCH request header of the present invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
To introduce the notion of relay station dedicated downlink channel in the embodiment of the invention, relay station (RS) uses this dedicated downlink channel to control signaling to terminal transmission.Particularly, dedicated downlink channel can initiatively be distributed by base station (BS) when relay station is finished network insertion and initialization, perhaps, and when relay station is finished network insertion and initialization, if not initiatively distribution of base station, then could be by relay station request base station assigns.
In addition, according to the embodiment of the invention, provide the relay station dedicated downlink channel (or to be called the private downlink resource, distribution method resource).Fig. 2 shows the schematic diagram that is used to implement multi-hop relay network of the present invention.In multi-hop relay network as shown in Figure 2, show three relay station RS 1, RS 2, RS 3, a base station BS 102, and several subscriber stations (SS) or terminal, wherein, SS 3, SS 4, SS 6 are positioned at the sub-district of RS 1, and SS 5, SS 6 are positioned at the sub-district of RS 2, and SS 7, SS 8 are positioned at the sub-district of RS 3; In addition, as shown in Figure 2,1 relay station RS 3 is arranged on the transmission path between base station BS and the subscriber station SS 7,2 relay station RS 1 and RS 2 are arranged on the transmission path between base station BS and the subscriber station SS5.
Method embodiment one
According to this embodiment, a kind of distribution method of relay station dedicated downlink channel is provided, this method can be applied to all multi-hop relay networks as shown in Figure 2.In the method, when relay station (RS) was finished network insertion and initialization, base station (BS) was that relay station (RS) distributes dedicated downlink channel.
Wherein, BS distributes dedicated downlink channel by the RS-DL_DCHassignment IE among the R-MAP (relay map message) (the relay station downlink dedicated channels is distributed cell) for RS.
In addition, the dedicated downlink channel that BS distributes can transmit a message signaling at least, the each dedicated downlink channel that distributes of BS is effective in N frame, and can upgrade according to the demand of traffic load, wherein, the demand of traffic load can periodically be calculated or be calculated after Event triggered by RS.
Like this, when terminal is carried out cycle ranging, the dedicated downlink channel that RS uses BS to distribute is controlled signaling to terminal transmission, the RNG-RSP that for example above mentions (range finding-answer message), MOB_NBR-ADV (Neighbor Advertisement), DCD (down channel describing message) and UCD (up channel describing message).
Method embodiment two
According to present embodiment, provide the distribution method of another kind of relay station dedicated downlink channel.A kind of the different of method of the method for present embodiment and method embodiment are that RS active request BS is its Resources allocation.Particularly, in the method, when RS finished network insertion and initialization, RS request BS distributed dedicated downlink channel.
Wherein, RS is by sending RS-DL_DCH request header (relay station downlink dedicated channels request header) to BS, and request BS distributes dedicated downlink channel.In response to the request of RS, BS is that RS distributes dedicated downlink channel by the RS-DL_DCH assignment IE among the R-MAP.
In addition, the dedicated downlink channel that BS distributes can transmit a message signaling at least, the each dedicated downlink channel that distributes of BS is effective in N frame, and can upgrade according to the demand of traffic load, wherein, the demand of traffic load can periodically be calculated or be calculated after Event triggered by RS.
Like this, when terminal is carried out cycle ranging, the dedicated downlink channel that RS uses BS to distribute is controlled signaling to terminal transmission, the RNG-RSP that for example above mentions (range finding-answer message), MOB_NBR-ADV (Neighbor Advertisement), DCD (down channel describing message) and UCD (up channel describing message).
Wherein, Fig. 4 shows the message structure of above-mentioned RS-DL_DCH request header, as shown in Figure 4, Header Content (8), HCS (8), Header Content (16), HT=1 (1), EC=1 (1), Type=1 (1), Extended Type=2 (3), TYPE (4), DCH Type (2), Header Content (4).Particularly, in conjunction with Fig. 4, following table 1 shows the corresponding description to this message format:
Table 1
| Grammer | Size | Note |
| The MAC head | ||
| HT | 1bit | Be made as 1 |
| EC | 1bit | Be made as 1 |
| Type | 1bit | Be made as 1 |
| Extended?TYPE | 3bits | DL DCH is made as 010 |
| TYPE | 4bits | The 0000=DCH application |
| 001-111=reserves | ||
| If (TYPE==0000) | The DCH application | |
| DCHTYPE | 2bits | 00=DCH increases progressively application 01=DCH and applies for that totally 10=DCH reserves based on speed 11= |
| If (DCHTYPE==00) | DCH increases progressively application | |
| Bandwidth request | 16 bits | The byte number of RS application.0 expression DCH discharges request. |
| N | 4bits | The every N of an allocated bandwidth frame repeats once |
| Elseif (DCHTYPE==01) | DCH totally applies for | |
| Bandwidth Request | 16 bits | The byte number of RS application.0 expression DCH discharges request. |
| N | 4bits | The every N of an allocated bandwidth frame repeats once. |
| Elseif (DCHTYPE==10) | DCH based on speed | |
| Average rate | 20bits | Mean data rate, be the highest 18bits of unit with the bytes per second: the minimum 2bits of amplitude: with 10 is the index at the end |
| } | ||
| RS CID | 8bits | The basic CID of the simplification of RS |
| } | ||
| HCS | 8bits | Verification sequence |
| } |
In addition, following table 2 message format that shows RS-DL_DCH assignment IE is described:
Table 2
| Grammer | Size | Note |
| RS_DL-DCH?assignment?IE{ | ||
| Type | 5bits | RS_DL-DCHassignmentIE＝ 0x02 |
| Length | 4bits | |
| RSCID | 8bits | The basic CID of the simplification of RS |
| Update?type | 2bits | The common 01=of 00=reserves based on service flow 10-11= |
| If(Update?type＝＝01){ | If based on service flow | |
| Throughput?size | 24bits | The size of throughput updating value is a unit with byte/s |
| Access?RSCID | 8bits | Finish the basic CID of simplification of the RS that MS inserts of service flow incident |
| } | ||
| Assignment?type | 2bits | The overall formula 10=of 00=incremental 01=removes 11=and removes all |
| OFDMA?symbol?offset | 8bits | |
| UIUC | 4bits | |
| Repetition?coding?indication | 2bits | It is that 2 0b10=repeated encoding speed are that 4 0b11=repeated encoding speed are 6 that 0b00=does not have repeated encoding 0b01=repeated encoding speed |
| Subchannel?offset | 8bits | |
| Duration | 10bits | The resource of distributing to DCH is (with OFDMA |
| Slots is a unit) | ||
| Frequency(N) | 4bits | Every N frame repeats primary distribution |
| } |
In addition, Fig. 3 shows the schematic flow according to the distribution method of the relay station dedicated downlink channel of the embodiment of the invention.By to Fig. 1 and Fig. 3 more as can be seen, by means of the present invention, in the multi-hop relay network, because BS has initiatively distributed dedicated downlink channel for RS in advance, perhaps to have asked BS in advance be that it has distributed dedicated downlink channel (flow process shown in the empty frame part among Fig. 3) to RS, therefore, when terminal is carried out cycle ranging, RS no longer needs to be used for to the downlink bandwidth of terminal transmission control signaling (promptly to BS application, flow process shown in the empty frame arrow among Fig. 1), but the dedicated downlink channel that can directly use BS to distribute comes control channel (for example, RNG-RSP message shown in Fig. 3), therefore, the time delay and the wasting of resources that message interaction process causes have been saved.
The above is the preferred embodiments of the present 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 protection scope of the present invention.
Claims (12)
1. the distribution method of a relay station dedicated downlink channel, the multi-hop relay network that is used for nontransparent centralized scheduling, this multi-hop relay network comprises base station, relay station and terminal, it is characterized in that, when relay station was finished network insertion and initialization, the base station was that relay station distributes dedicated downlink channel.
2. method according to claim 1 is characterized in that, described base station is that to distribute cell be that RS-DL_DCH assignment IE is that described relay station distributes dedicated downlink channel for relay station downlink dedicated channels among the R-MAP by relay map message.
3. method according to claim 1 is characterized in that, the dedicated downlink channel of described base station assigns can transmit a message signaling at least.
4. method according to claim 1, it is characterized in that, the each dedicated downlink channel that distributes in described base station is effective in N frame, and can upgrade according to the demand of traffic load, wherein, the demand of traffic load can periodically be calculated or be calculated after Event triggered by described relay station.
5. according to each described method in the claim 1 to 4, it is characterized in that when the described terminal cycle of carrying out found range, described relay station used the dedicated downlink channel of described base station assigns to described terminal transmission control signaling.
6. the distribution method of a relay station dedicated downlink channel, the multi-hop relay network that is used for nontransparent centralized scheduling, this multi-hop relay network comprises base station, relay station and terminal, it is characterized in that, when relay station is finished network insertion and initialization, relay station request base station assigns dedicated downlink channel.
7. method according to claim 6 is characterized in that, described relay station is RS-DL_DCHrequest header by sending relay station downlink dedicated channels request header to described base station, asks described base station assigns dedicated downlink channel.
8. method according to claim 7 is characterized in that, in response to the request of described relay station, described base station is that described relay station distributes dedicated downlink channel by the RS-DL_DCH assignment IE among the R-MAP.
9. method according to claim 8 is characterized in that, the dedicated downlink channel of described base station assigns can transmit a message signaling at least.
10. method according to claim 8, it is characterized in that, the each dedicated downlink channel that distributes in described base station is effective in N frame, and can upgrade according to the demand of traffic load, wherein, the demand of traffic load can periodically be calculated or be calculated after Event triggered by described relay station.
11., it is characterized in that when the described terminal cycle of carrying out found range, described relay station used the dedicated downlink channel of described base station assigns to described terminal transmission control signaling according to each described method in the claim 6 to 10.
12. relay station dedicated downlink channel, the multi-hop relay network that is used for nontransparent centralized scheduling, this multi-hop relay network comprises base station, relay station and terminal, it is characterized in that, described relay station uses described dedicated downlink channel to described terminal transmission control signaling, wherein, described dedicated downlink channel is initiatively distributed by described base station when described relay station is finished network insertion and initialization, perhaps when described relay station is finished network insertion and initialization by the described base station assigns of described relay station request.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010127520A1 (en) * | 2009-05-05 | 2010-11-11 | 中兴通讯股份有限公司 | Method of random access and base station |
| WO2010145464A1 (en) * | 2009-06-19 | 2010-12-23 | 中兴通讯股份有限公司 | Method and device for relay node access |
| WO2023030059A1 (en) * | 2021-08-29 | 2023-03-09 | 富士通株式会社 | Beam indication method, apparatus and system for repeater |
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2007
- 2007-09-05 CN CNA2007101460267A patent/CN101384075A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010127520A1 (en) * | 2009-05-05 | 2010-11-11 | 中兴通讯股份有限公司 | Method of random access and base station |
| WO2010145464A1 (en) * | 2009-06-19 | 2010-12-23 | 中兴通讯股份有限公司 | Method and device for relay node access |
| US8750196B2 (en) | 2009-06-19 | 2014-06-10 | Zte Corporation | Method and device for relay node access |
| CN101932103B (en) * | 2009-06-19 | 2015-08-12 | 中兴通讯股份有限公司 | A kind of method of via node access |
| WO2023030059A1 (en) * | 2021-08-29 | 2023-03-09 | 富士通株式会社 | Beam indication method, apparatus and system for repeater |
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