CN102783238B - For accidental access method and the base station of wireless relay communication system - Google Patents
For accidental access method and the base station of wireless relay communication system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/008—Transmission of channel access control information with additional processing of random access related information at receiving side
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
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Abstract
The present invention proposes a kind of accidental access method for wireless relay communication system, the via node that described wireless relay communication system comprises base station and is associated with described base station, said method comprising the steps of: described base station assigns is specifically designed to the preamble set of described via node; Described base station notifies described preamble set to described via node; During link failure between described base station and described via node, described via node Stochastic choice preamble from described preamble set sends random access request to base station.The invention allows for the base station realizing described accidental access method.According to the present invention, base station by distributing to via node and notifying dedicated preamble set, can make via node quickly recover to connection status when RLF occurs, guarantees the impact of normal user equipments minimum simultaneously.
Description
Technical field
The present invention relates to the random access procedure in LTE-A (LongTermEvolutionAdvance, Long Term Evolution project) system, more specifically, relate to the random access procedure under the scene being deployed with type i relaying.
Background technology
In recent years, the research of relaying technique is caused gradually to the concern of people.Relaying technique is taken as and improves cell capacity and expanded areas of coverage with the good candidate technologies of the one meeting LTE-A.In standardized process, reaching an agreement with regard to following provisions: type i relaying should have the physical district ID of self, and be similar to independently base station (eNB), is visible for subscriber equipment.
Fig. 1 shows the schematic diagram of fundamental node in the system being deployed with type i relaying and interface, wherein, Uu (user-user) represents the interface between subscriber equipment and via node, and Un (user-network) represents the interface between via node and base station eNB.
In list of references [1], reach an agreement with regard to resource division in the band between the back haul link of type i relaying and access link, wherein specify: in single frequency band, carry out time division multiplexing to via node to the link of base station and subscriber equipment to the link of via node, namely any moment only has a link effective.
Fig. 2 gives the basic operation at the wireless communication system being deployed with type i relaying.As shown in Figure 2, wherein, in backhaul DL subframe, new physical control channel (referred to herein as " R-PDCCH ") is used to come to RN Resources allocation.In addition, when relaying node RN is in connection status, it also can only by the downlink traffic of R-PDCCH reception from base station (DeNB).Below, for simplicity, the UE that RN serves is called RN-UE, and the UE that eNB serves is called grand-UE.
Under normal circumstances, Un link, owing to using higher antenna height and advanced antenna technology etc., thus can keep relatively good channel quality.But Un link also may suffer radio jink failure (RLF), and via node must perform process of reconstruction in some environments.Such as, in heterogeneous network, becoming dry to disturb time high to make the receiver at via node place occur penalty.Another example is: when via node moves along with vehicle, and the fail safe of Un link is also good not.When RLF occurs, consider that a via node may serve multiple RN-UE simultaneously, so more need via node can return to connection status fast, minimum to make the impact of RN-UE.
Proposed some schemes now, for when there is RLF on Un link, via node performs RRC connection reconstruction process, and initiating random access procedure.But in existing scheme, via node is all perform the Stochastic accessing based on competition.That is, via node Stochastic choice preamble from the preamble set of base station previous broadcast carries out Stochastic accessing.In this case, base station cannot differentiate from via node and the random access request from common grand-UE.
Below existing scheme Problems existing is made a concrete analysis of:
Because base station None-identified is from the random access request of RN or common grand-UE, base station uses PDCCH to send accidental access response.If via node continues to serve RN-UE, because it is in the interior operation of band as mentioned above, so this accidental access response cannot be received.In this case, as the direct settling mode of one, via node can stop serving RN-UE, then uses PDCCH receiving random access response during RA (Stochastic accessing) response window.In this window, the RN-UE that via node serves to it sends broadcast message, CRS, control signal etc.Now, RN-UE will be in deep fade state.As can be seen here, this scheme is very large for the impact of RN-UE.If there is competition, RN can use the random back time again to perform Stochastic accessing.Further, when the number of RN-UE is very large, this impact cannot be ignored more, and such as more UE perform RRC and rebuild, or enter idle condition suddenly.
Therefore, a kind of mechanism must be designed, when making via node can occur RLF on Un link, quickly recover to connection status, simultaneously minimum on the impact of the UE that relaying is served.This is target of the present invention.
List of references
[1].TR36.814，“FurtheradvancementsforE-UTRAphysicallayeraspects”.
Summary of the invention
The object of the invention is to propose a kind of accidental access method, make via node from the radio jink failure Un link, connection status can be returned to fast, guarantee the impact of subscriber equipment minimum simultaneously.
According to a first aspect of the invention, propose a kind of accidental access method for wireless relay communication system, described wireless relay communication system comprises base station and the via node with described base station association, said method comprising the steps of: described base station assigns is specifically designed to the preamble set of described via node; Described base station notifies described preamble set to described via node; And during link failure between described base station and described via node, described via node Stochastic choice preamble from described preamble set sends random access request to base station.
Preferably, the preamble set that base station assigns is specifically designed to described via node comprises: the preamble set being used for Stochastic accessing is divided into competition preamble set and non-competing preamble set by base station, wherein competes the subscriber equipment that preamble set is served for base station itself; Non-competing preamble set is divided into the non-competing preamble subset of non-competing preamble subset sums for described via node of the subscriber equipment of serving for base station itself; And give described via node by the non-competing preamble subset allocation for described via node.
Preferably, to described via node, base station notifies that described preamble set comprises: described base station notifies described preamble set by broadcast signaling to described via node.
Preferably, to described via node, described base station notifies that described preamble set comprises: described base station notifies described preamble set by dedicated signaling to described via node.
Preferably, described preamble set is based on non-competing preamble set.
Preferably, the step that described base station assigns is specifically designed to the preamble set of described via node performs based on following properties: the number of the number of the subscriber equipment that the number of the via node be associated with base station, base station are served, the subscriber equipment of relay node services and wireless chaining status.
Preferably, described accidental access method also comprises: identification of base stations from the random access request of via node, and utilizes R-PDCCH to send accidental access response to via node.
Preferably, described accidental access method also comprises: via node receiving random access response, and sends RRC connection reconstruction message to base station.
Preferably, described accidental access method also comprises: when RRC connection reconstruction failure time, via node to its serve and be in RRC connect subscriber equipment transmission RRC connection release message.
According to a further aspect in the invention, propose base station described in a kind of base station and comprise: random preamble code assign ment unit, for being specifically designed to the preamble set of described via node based on distribution, described via node is associated with described base station; And preamble set notification unit, for being specifically designed to the preamble set of described via node to described via node notice, so that during link failure between described base station and described via node, described via node Stochastic choice preamble from described preamble set comes to send random access request to base station.
Utilize the present invention, base station by distributing to via node and notifying dedicated preamble set, can make via node quickly recover to connection status when RLF occurs, guarantees the impact of normal user equipments minimum simultaneously.
Accompanying drawing explanation
By reference to the accompanying drawings, according to below to the detailed description of non-limiting example of the present invention, above-mentioned and other objects, features and advantages of the present invention will become clearly, in accompanying drawing:
Fig. 1 shows the schematic diagram of fundamental node in the system being deployed with type i relaying and interface;
Fig. 2 shows the communication utilizing common subframe between existing via node and RN-UE, and the example utilizing the communication of backhaul subframe between existing base station and via node;
Fig. 3 shows the flow chart of the accidental access method for wireless relay communication system according to the embodiment of the present invention;
Fig. 4 shows the schematic diagram distributed according to the preamble for Stochastic accessing of the embodiment of the present invention;
Fig. 5 shows an example of the random access procedure according to the embodiment of the present invention;
Fig. 6 shows the example of the improvement of the random access procedure according to the embodiment of the present invention; And
Fig. 7 shows the structural representation implemented according to the system of the accidental access method of the embodiment of the present invention.
Embodiment
Below, embodiments of the invention are described in detail by reference to the accompanying drawings.In the following description, some specific embodiments only for describing object, and should not be construed and have any restriction to the present invention, and just example of the present invention.It is pointed out that schematic diagram illustrate only the difference with existing system, and eliminate conventional structure or structure, in order to avoid cause the understanding of the present invention unclear.
In traditional specifications, base station distributes two random access preamble set usually, that is, based on the preamble set of competition with based on non-competing preamble set.The former sends to subscriber equipment by broadcast signaling, for the Stochastic accessing based on competition of subscriber equipment.And the latter divides by dedicated signaling to be used in subscriber equipment and to carry out based on non-competing Stochastic accessing, such as, switch, down link data arrives and location etc.
The present invention is directed to the scene introducing type i relaying, propose and be specifically designed to via node from traditional based on distributing non-competing preamble subset non-competing preamble set.In this case, there are two non-competing preamble subsets, be respectively used to via node and grand-UE.The non-competing preamble subset distributing to via node is informed to via node further by broadcast signaling or dedicated signaling by base station.When there is RLF in the link between via node and base station, via node can use dedicated preamble to perform random access procedure, to make base station can identify access request from via node, and the R-PDCCH in DLUn subframe is utilized to send it back accidental access response.Like this, via node knows that receiving access wherefrom responds, and sends RRC connection reconstruction message fast.
Fig. 3 shows the flow chart of the accidental access method for wireless relay communication system according to the embodiment of the present invention.This wireless relay communication system comprises base station, subscriber equipment and via node.
As shown in Figure 3, in step S301, base station assigns is specifically designed to the preamble set of described via node.Here, preamble set is based on non-competing preamble set, and above-mentioned distribution can perform based on following properties: the number of the number of the subscriber equipment that the number of the via node be associated with base station, base station are served, the subscriber equipment of relay node services and Un wireless chaining status etc.Then, in step S303, base station notifies described preamble set to via node.Here, base station can perform above-mentioned notice by the broadcast signaling of such as system broadcast information and so on, or also can carry out orientation notice by dedicated signaling.During link failure between base station and via node, via node Stochastic choice preamble from described preamble set, for performing the Stochastic accessing (step S305) to described base station, then sends random access request (step S307) to base station.Then, identification of base stations from the random access request (step S309) of via node, and utilizes R-PDCCH to send accidental access response (step S311) to via node.Then, in step S313, via node receiving random access response, and RRC connection reconstruction message is sent to base station, this step is identical with existing operation.As described above, in the LTE-A disposing relaying, base station is in backhaul DL subframe, and use R-PDCCH to come to via node Resources allocation, thus via node knows the response how received from base station.Here, the random access procedure sent between RRC connection reconstruction message due to base station is identical with random access procedure of the prior art, thus repeats no more.
In addition, when via node performs the failure of RRC connection reconstruction (such as time-out), via node initiatively sends RRC connection release message (not shown) to the subscriber equipment being in RRC connection status of its service, thus avoids invalid signaling and transfer of data.
Although it should be noted that above-mentionedly only to illustrate a via node, but it will be understood by those skilled in the art that above-mentioned accidental access method is equally applicable to be deployed with the wireless relay communication system of multiple via node.
Be described in detail to the application of the accidental access method shown in Fig. 3 in lte-a system below.Certainly, this method is also applicable to the wireless access wide band technology of such as WIMAX and so on.
Fig. 4 shows the schematic diagram distributed according to the preamble for Stochastic accessing of the embodiment of the present invention.As shown in Figure 4, the division of base station first as described above in traditional specifications, whole preamble set is divided into competition preamble set (with the part that left oblique line represents in Fig. 4) and non-competing preamble set (with the part that horizontal line represents in Fig. 4), (that is, not associating each other) that these two set are mutually orthogonal.Then, base station further non-competing preamble set is divided into for grand-UE non-competing preamble subset sums for via node non-competing preamble subset (namely, the set of the preamble that via node is special), these two subsets also keep orthogonal each other equally.Like this, the impact that grand-UE is caused can be minimized.
The size of preamble subset can be determined in base station based on the parameter of system and configuration (number, wireless link channel quality etc. of the subscriber equipment that the number of the subscriber equipment that the number of the via node be such as associated with base station, base station are served, via node are served).Such as, when the number of via node is less, or current when only using the via node of fixed number, then and the size for the non-competing preamble subset of via node can keep very little.
It should be noted that, although perform random access preamble batch operation as shown in Figure 4 by base station in this example, but it will be understood by those skilled in the art that this operation also can have been come by the superior node having a similar functions with base station.
Fig. 5 shows an example of the random access procedure according to the embodiment of the present invention, and Fig. 6 shows the example of the improvement of the random access procedure according to the embodiment of the present invention.Both of these case is all carry out on the basis that random access preamble as shown in Figure 4 distributes, and the random access procedure that is shown in Fig. 5 and Fig. 6 all distributes based on the random access preamble in Fig. 4.
As shown in Figure 5, base station sends the preamble subset (step S501) for via node as shown in Figure 4 by system broadcast information.Because the preamble subset at this moment for via node is that multiple via node is shared, thus this method can reduce the size of the preamble subset for via node, distribute larger non-competing preamble subset can to grand-UE.When RLF appears in the Un link between base station and via node, via node is from coming for Stochastic choice preamble the preamble subset of via node to send random access request (step S503) to base station.Then, identification of base stations from the random access request of via node, and utilizes R-PDCCH to send accidental access response (step S505) to via node.Via node receiving random access response, and send RRC connection reconstruction message (step S507) to base station.Ensuing process is identical with existing random access procedure, thus repeats no more here.
Shown below is the illustrative arrangement of the element of the system broadcast information being specifically designed to via node.
As implied above, numberOfRA-Preambles-RN represents the size of the preamble subset for via node.After receiving system broadcast information as shown in the figure, via node can infer that preamble uses numberOfRA-Preambles to numberOfRA-Preambles-RN-1, and wherein numberOfRA-Preambles is the size based on non-competing preamble.
Certainly, in this example, if two via nodes select identical preamble from for the preamble set of via node, then still competition may be there is.But, consider that the RLF on Un link can not occur so continually, thus this problem not serious.
As the improvement to the random access procedure shown in Fig. 5, in Fig. 6, notify the preamble subset for it mainly through dedicated signaling to via node.As shown in Figure 6, base station sends the preamble subset (step S601) for via node as shown in Figure 4 by dedicated signaling, namely connects reconfiguration message to each via node fixed direction allocation preamble subset for via node as shown in Figure 4 by RRC.In this case, if give each via node dispense needles to the different preambles in the preamble subset of via node, then the competition between the via node that may occur in example as shown in Figure 5 can be avoided.Certainly, distribute identical preamble also can to different via node.In step S603, via node sends RRC connection and has reshuffled message to base station, receive this preamble to represent.Then, when RLF appears in the Un link between base station and via node, via node utilizes the preamble received to send random access request (step S605) to base station.Identification of base stations from the random access request of via node, and utilizes R-PDCCH to send accidental access response (step S607) to via node.Via node receiving random access response, and send RRC connection reconstruction message (step S609) to base station.Ensuing process is identical with existing random access procedure, thus repeats no more here.
Provide the illustrative arrangement of the information element of the dedicated signaling being specifically designed to via node equally.
As implied above, base station distributes dedicated preamble with ra-PreambleIndex form to via node, and wherein ra-PreambleIndex represents the sequence number of the dedicated preamble distributing to via node.
Fig. 7 shows the structural representation implemented according to the system of the accidental access method of the embodiment of the present invention, the via node 20 that this system comprises base station 10 and is associated with this base station.
As shown in Figure 7, base station 10 comprises: random preamble code assign ment unit 101, for distributing the preamble being specifically designed to via node set, this preamble set is based on non-competing preamble set, and can perform this distribution based on following properties: the number of the subscriber equipment that the number of the subscriber equipment that the number of the via node be associated with base station, base station are served, via node are served and wireless chaining status etc.; And preamble set notification unit 103, for being specifically designed to the preamble set of via node to via node notice.
Preferably, random preamble code assign ment unit 101 is configured to: the preamble set being used for Stochastic accessing is divided into competition preamble set and non-competing preamble set, wherein competes the subscriber equipment that preamble set is served for base station itself; Non-competing preamble set is divided into the non-competing preamble subset of non-competing preamble subset sums for described via node of the subscriber equipment of serving for base station itself; And give described via node by the non-competing preamble subset allocation for described via node.
Preamble set notification unit 103 is by the broadcast signaling of such as system broadcast information and so on or notified to via node by dedicated signaling.
Alternatively, base station 10 also comprises: random access request receiving element 105, for receiving the random access request from via node; Random access request recognition unit 107, for identifying the random access request from via node; And accidental access response transmitting element 109, utilize R-PDCCH to send accidental access response to via node.
In the present embodiment, via node 20 is identical with existing type i via node, the main distinction is: when via node 20 performs the failure of RRC connection reconstruction, such as time-out, via node 20 initiatively sends RRC connection release message to the subscriber equipment being in RRC connection status with it, thus avoids invalid signaling and transfer of data.
To be described although illustrated in Fig. 7 for the system being deployed with a via node, but, it will be understood by those skilled in the art that the system being also applicable to be deployed with more than one via node according to the accidental access method of the embodiment of the present invention.
In sum, the invention provides a kind of random preamble code assign ment mechanism and meet the informing mechanism of random preamble code of Current specifications, for distributing to via node and notifying dedicated preamble, so that via node quickly recovers to connection status when RLF occurs.
Compared with existing scheme, the mechanism proposed has the following advantages: when RLF occurs, provides Restoration Mechanism very fast; Minimum on the impact of RN-UE and grand-UE; And there is good scalability, and multi-hop scene (i.e. multiple via node) can be easily extended to.
Although more than describe and relate to multiple unit, by being multiple unit by a dividing elements or being a unit by multiple unit combination, as long as it still can perform corresponding function, also the present invention can be realized.In addition, for type i relaying, the present invention is specifically described although above-mentioned, it will be understood by those skilled in the art that the present invention is also applicable to the other system of the LTE-A deploying the via node similar with type i relaying.
Those skilled in the art should be easy to recognize, can be realized the different step of said method by programmed computer.At this, some execution modes comprise equally machine readable or computer-readable program storage device (as, digital data storage medium) and encoding machine can perform or the executable program command of computer, wherein, this instruction performs some or all steps of said method.Such as, program storage device can be digital storage, magnetic storage medium (as Disk and tape), hardware or the readable digital data storage medium of light.Execution mode comprises the programmed computer of the described step performing said method equally.
Description and accompanying drawing only illustrate principle of the present invention.Therefore it should be appreciated that those skilled in the art can advise different structures, although these different structures clearly do not describe herein or illustrate, embody principle of the present invention and be included within its spirit and scope.In addition, all examples herein mentioned clearly main only for teaching purpose with the design of the promotion this area helping reader understanding's principle of the present invention and inventor and contribute, and should be interpreted as not being the restriction to these specific examples of mentioning and condition.In addition, herein all mention principle of the present invention, aspect and execution mode statement and specific example comprise its equivalent.
Description is above only for realizing embodiments of the present invention; it should be appreciated by those skilled in the art; the any modification or partial replacement do not departed from the scope of the present invention; the scope that all should belong to claim of the present invention to limit; therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (17)
1., for an accidental access method for wireless relay communication system, described wireless relay communication system comprises base station and the via node with described base station association, said method comprising the steps of:
Described base station assigns is specifically designed to the preamble set of described via node, and wherein distributed described preamble set is orthogonal with the preamble set of the subscriber equipment that described base station is served;
Described base station notifies the preamble set distributed to described via node; And
During link failure between described base station and described via node, described via node Stochastic choice preamble from distributed described preamble set sends random access request to base station.
2. accidental access method according to claim 1, the preamble set that described base station assigns is specifically designed to described via node comprises:
The preamble set being used for Stochastic accessing is divided into competition preamble set and non-competing preamble set by base station, wherein competes the subscriber equipment that preamble set is served for base station itself;
Non-competing preamble set is divided into the non-competing preamble subset of non-competing preamble subset sums for described via node of the subscriber equipment of serving for base station itself; And
Described via node is given by the non-competing preamble subset allocation for described via node.
3. accidental access method according to claim 1, wherein, to described via node, described base station notifies that described preamble set comprises: described base station notifies described preamble set by broadcast signaling to described via node.
4. accidental access method according to claim 1, wherein, to described via node, described base station notifies that described preamble set comprises: described base station notifies described preamble set by dedicated signaling to described via node.
5. the accidental access method according to any one of claim 1 and 3-4, wherein, described preamble set is based on non-competing preamble set.
6. the accidental access method according to any one of claim 1-4, wherein, the step that described base station assigns is specifically designed to the preamble set of described via node performs based on following properties:
The number of the number of the subscriber equipment that the number of the via node be associated with base station, base station are served, the subscriber equipment of relay node services and wireless chaining status.
7. the accidental access method according to any one of claim 1-4, also comprises: identification of base stations from the random access request of via node, and utilizes R-PDCCH to send accidental access response to via node.
8. the accidental access method according to any one of claim 1-4, also comprises:
Via node receiving random access response, and RRC connection reconstruction message is sent to base station.
9. accidental access method according to claim 8, also comprises:
When RRC connection reconstruction failure time, via node to its serve and be in RRC connect subscriber equipment transmission RRC connection release message.
10. a base station, described base station comprises:
Random preamble code assign ment unit, for distributing specially for the preamble set of via node, described via node is associated with described base station, and wherein distributed described preamble set is orthogonal with the preamble set of the subscriber equipment that described base station is served; And
Preamble set notification unit, for being specifically designed to the preamble set of described via node to described via node notice, so that during link failure between described base station and described via node, described via node Stochastic choice preamble from distributed described preamble set comes to send random access request to base station.
11. base stations according to claim 10, wherein, distribute and comprise for the preamble set of described via node specially:
The preamble set being used for Stochastic accessing is divided into competition preamble set and non-competing preamble set, wherein competes the subscriber equipment that preamble set is served for base station itself;
Non-competing preamble set is divided into the non-competing preamble subset of non-competing preamble subset sums for described via node of the subscriber equipment of serving for base station itself; And
Described via node is given by the non-competing preamble subset allocation for described via node.
12. base stations according to claim 10, wherein, comprise for the preamble set of described via node specially to described via node notice:
Described preamble set notification unit notifies described preamble set by broadcast signaling to described via node.
13. base stations according to claim 10, wherein, comprise for the preamble set of described via node specially to described via node notice:
Described preamble set notification unit notifies described preamble set by dedicated signaling to described via node.
14. base stations according to any one of claim 10 and 12-13, wherein, described preamble set is based on non-competing preamble set.
15. base stations according to any one of claim 10-13, wherein said random preamble code assign ment unit is configured to distribute based on predetermined properties the preamble set being specifically designed to described via node, and described predetermined properties comprises:
The number of the number of the subscriber equipment that the number of the via node be associated with base station, base station are served, the subscriber equipment of relay node services and wireless chaining status.
16. base stations according to any one of claim 10-13, also comprise:
Random access request receiving element, for receiving the random access request from via node;
Random access request recognition unit, for identifying the random access request from via node; And
Accidental access response transmitting element, utilizes R-PDCCH to send accidental access response to the via node that have sent random access request.
17. base stations according to claim 10, wherein, described via node is configured to: when performing the failure of RRC connection reconstruction, to described relay node services and be in the subscriber equipment that RRC connects and send RRC connection release message.
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| PCT/CN2010/000443 WO2011123973A1 (en) | 2010-04-06 | 2010-04-06 | Random access method for radio relay communication system and base station thereof |
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