CN102111769B - Carrier resource allocation method for user equipment (UE) - Google Patents
Carrier resource allocation method for user equipment (UE) Download PDFInfo
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- CN102111769B CN102111769B CN 200910243872 CN200910243872A CN102111769B CN 102111769 B CN102111769 B CN 102111769B CN 200910243872 CN200910243872 CN 200910243872 CN 200910243872 A CN200910243872 A CN 200910243872A CN 102111769 B CN102111769 B CN 102111769B
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Abstract
The invention discloses a carrier resource allocation method for user equipment (UE), which comprises that: in the network planning of a system consisting of a plurality of distributed cells, for each node in each distributed cell, a radio network controller (RNC) sets all carriers to be available carriers of the nodes; for boundary nodes in each distributed cell, the RNC divides the available carriers of the boundary nodes into the available carriers with a high carrier priority and the available carriers with a low carrier priority, and for any adjacent boundary nodes, the carriers with thehigh priority are different; for other non-boundary nodes except the boundary nodes, the available carriers of the non-boundary nodes do not have carrier priorities; and when the UE accesses the system from any boundary node, the RNC allocates carrier resources to the UE according to the carrier priority of the boundary node. By the method, same frequency interference among the distributed cells is avoided as much as possible, and the throughput of the cell is increased.
Description
Technical field
The present invention relates to the resource allocation methods in the communication system, particularly the carrier wave resource allocation method of a kind of UE.
Background technology
Distributed system is a very important application scenarios for the TD-SCDMA system.For the TD-SCDMA distributed system, can be subdivided into a lot of scenes again: (a): a plurality of single channels cover and form a distributing cell, as shown in Figure 1; (b): a plurality of binary channels cover and form a distributing cell, as shown in Figure 2; (c): single channel and binary channels form mixed distribution formula residential quarter.For each area of coverage in the above-mentioned distributing cell (cell portion), be not limited to single channel and cover or binary channels, also can be the zone that any port number covers.For the sake of simplicity, the below describes as an example of the first scene example.
Under a lot of scenes, an independent distributing cell is difficult to meet the demands, and usually needs a plurality of distributing cells to carry out networking, for example station, street networking shown in Figure 3 or large stadium annular networking shown in Figure 4.For the networking of distributed system, exist the interference problem between distributing cell.Generally speaking, area of coverage (being also referred to as node) in distributing cell only is comprised of one or two passage, for the macro base station that uses smart antenna, the antijamming capability of this node is relatively poor, can cause interference each other between each area of coverage.
The major programme that solves at present the distributed system interference problem is, adjacent distributing cell is used alien frequencies, to eliminate the co-channel interference that produces between them, that is to say for adjacent distributing cell, distribute different available frequency (being carrier resource).As shown in Figure 3, Figure 4, having used frequency reuse in the networking plan is that 2 pairs of neighbor cells are isolated, particularly, if have two frequency F1 and F2, the available frequency that residential quarter 1 (Cell 1) and residential quarter 4 (Cell 4) are set is F1, and the available frequency of residential quarter 2 (Cell2) and residential quarter 3 (Cell 3) is F2.After carrying out networking according to this scheme, RNC can only select carrier resource to distribute to UE in the available frequency of this residential quarter when being UE distributing carrier wave resource in the distributing cell.
Above-mentioned networking plan of carrying out for solving interference problem because different available frequencies need to be distributed in adjacent distributions formula residential quarter, so the frequency that each residential quarter can be used reduced, thereby so that cell capacity also greatly reduce.
Summary of the invention
In view of this, the invention provides the carrier wave resource allocation method of a kind of UE, the co-channel interference between can either the reduce distributing cell can improve cell capacity simultaneously.
For achieving the above object, the present invention adopts following technical scheme:
The carrier wave resource allocation method of a kind of UE comprises:
For the system that is made of a plurality of distributing cells, when carrying out the network planning, for each node in each described distributing cell, all carrier waves of RNC are set to its available carrier wave; For the boundary node in each distributing cell, RNC is divided into high and low two carrier wave priority with its available carrier wave, and for any two adjacent boundary nodes, the carrier wave that is set to high priority thereon is different; For other the non-boundary nodes except the node of border, its available carrier wave does not arrange carrier wave priority;
When UE accessed from arbitrary boundary node, RNC was described UE distributing carrier wave resource according to the carrier wave priority of this arbitrary boundary node.
Preferably, for the UE that uses the space division multiplexing resource, when the arbitrary described distributing cell of access, RNC is the different UEs of the same node of access, the carrier resource that priority allocation is different.
Preferably, for the UE that does not carry out the carrier resource space division multiplexing, RNC is described UE distributing carrier wave resource according to the principle of balanced each carrier load.
Preferably, when the described UE that does not carry out the carrier resource space division multiplexing accessed from non-boundary node, RNC was described UE priority allocation is set to low priority at boundary node carrier resource.
Preferably, RNC determines that UE from the mode of described boundary node access is: the information that NodeB uploads by PRACH according to UE, and described PRACH is estimated to determine the passage at PRACH place, and the channel information of determining is sent to RNC.
Preferably, the method further comprises:
When the UE in the distributing cell moved to arbitrary boundary node from non-boundary node, if carrier wave is for being set to the carrier wave of low priority under this UE in this arbitrary boundary node, then RNC switched to this UE on the high priority carrier wave of this arbitrary boundary node.
Preferably, RNC determines that the UE in the distributing cell from the mode that non-boundary node moves to arbitrary boundary node is: the strongest node of this UE becomes described arbitrary boundary node by described non-boundary node.
Preferably, when not having enough resources to distribute to described UE on the high priority carrier wave of described arbitrary boundary node, RNC distributes to described UE from being positioned on arbitrary non-boundary node and releasing resource on the carrier resource identical with the high priority carrier wave of described arbitrary boundary node.
Preferably, the method further comprises:
When the arbitrary UE in the described distributing cell residential quarter occurs switched, RNC switched to this UE on the high priority carrier wave on the object boundary node of Target cell.
Preferably, the method further comprises: the carrier wave priority attribute is set in the adjacent cell list of each residential quarter in RNC in advance, is used for preserving the priority attribute of each available carrier wave on this adjacent cell boundary node adjacent with this residential quarter;
Described RNC switches to this UE on the high priority carrier wave on the object boundary node of Target cell: the carrier wave priority attribute that arranges in the adjacent cell list of described RNC according to the cell-of-origin is described UE distributing carrier wave resource.
As seen from the above technical solution, among the present invention, for the system that is consisted of by a plurality of distributing cells, all carrier waves all are set to available carrier wave; Boundary node and non-boundary node for each distributing cell arrange respectively, for boundary node, its all available carrier wave are set to high and low two carrier wave priority, and any two adjacent boundary nodes, and the carrier wave that is set to high priority thereon is different; For non-boundary node, available carrier wave does not arrange carrier wave priority; When UE accesses from arbitrary boundary node, be UE distributing carrier wave resource according to the carrier wave priority on this node.On the one hand, by setting and the allocation of carriers of UE on boundary node of carrier wave priority on the above-mentioned boundary node, can avoid the co-channel interference between distributing cell as far as possible; On the other hand, all carrier waves are available carrier wave on non-boundary node, and priority are not set, thereby improve the throughput of residential quarter.
Description of drawings
Fig. 1 is that single channel RRU covers the distributing cell schematic diagram that forms.
Fig. 2 is that binary channels RRU covers the distributing cell schematic diagram that forms.
Fig. 3 is station, the street networking schematic diagram that a plurality of distributing cells consist of.
Fig. 4 is the large stadium annular networking schematic diagram that a plurality of distributing cells consist of.
Fig. 5 is the frequency planning schematic diagram of a plurality of distributing cells when annular covers among the present invention.
Fig. 6 is the particular flow sheet of the carrier wave resource allocation method among the present invention.
Fig. 7 is the initial access process schematic diagram of UE among the present invention.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, below in conjunction with accompanying drawing the present invention is described in further details.
Generally speaking, all have larger isolation between each node in the same distribution residential quarter, so adjacent distributions formula residential quarter generally only has the larger interference of existence between the adjacent node in border, and that other node disturbs generally speaking is less.For example, in the networking schematic diagram shown in Figure 5 among the node A of Cell 1 and the Cell 2 Node B be exactly the adjacent node in border of adjacent distributions formula residential quarter, may have larger interference between this node A and the Node B.And for two adjacent distributions formula residential quarters, neither necessarily there be larger interference in the adjacent node in border, for example, if just in two nodes a wall or other spacers are arranged, also may not have larger interference between these two nodes.Based on this, the concept of definition boundary node among the present invention: adjacent with the node of other distributing cell, to have more strongly disturbing node simultaneously be boundary node.Other nodes except the node of border are non-boundary node.
Based on above-mentioned analysis, basic thought of the present invention is: because adjacent distributions formula residential quarter only has and has stronger interference between the boundary node generally speaking, therefore, only consider that at the planning frequency boundary node is carried out alien frequencies to be processed, and for non-boundary node, can use all frequencies, thereby when guaranteeing to reduce co-channel interference, improve cell throughout.
The present invention by carrier wave priority is set at boundary node, and distributes according to the carrier resource that priority is carried out boundary node, thereby realizes the alien frequencies of adjacent boundary node is processed in the specific implementation process.
Particularly, Fig. 6 is the particular flow sheet of the carrier wave resource allocation method among the present invention.As shown in Figure 6, the method comprises:
In the distributing cell networking of carrying out according to the present invention, for each node, all carrier waves are set to its available carrier wave.
And, owing to can not produce larger interference between the non-boundary node in the different distributions formula residential quarter, therefore for non-boundary node, available carrier wave does not arrange carrier wave priority, RNC can distribute for the UE in the non-boundary node arbitrarily available carrier wave, thereby has greatly improved cell throughout;
Because two adjacent boundary nodes of adjacent distributions formula residential quarter, may produce larger interference, therefore, be set to high and low two priority for all available carrier wave of this node of boundary node, and for any two adjacent boundary nodes, the high priority carrier wave is different.
Concrete giving an example as shown in Figure 5 of arranging, the node among Fig. 5 shown in the shade is boundary node, other nodes are non-boundary node.When arranging according to this step, suppose to have 2 available carrier wave, be respectively F1 and F2, be available carrier wave for all node F1 and F2; For boundary node, RNC F1 is set to the high priority carrier wave of A node, F2 is set to the lower priority carriers of A node, F2 is set to the high priority carrier wave of B node, F1 is set to the lower priority carriers of B node, like this, for two adjacent nodes of AB, its high priority carrier wave F1 and F2 are different.Arranging of other several boundary nodes is identical, just repeats no more here.For non-boundary node, F1 and F2 do not have prioritization.Here, the explanation as an example of two carrier waves example, in fact for identical greater than the situation of two carrier waves, wherein, the high priority carrier wave can be for a plurality of, and lower priority carriers also can be set to a plurality of.
Based in the step 601 to the setting of boundary node carrier wave priority, when in this step being access user distributing carrier wave resource, if this user accesses from boundary node, then RNC is set to this UE distributing carrier wave resource according to the carrier wave priority on this boundary node, namely is preferably the carrier wave that UE distributes high priority.Like this, for two adjacent boundary nodes, if carrier resource is more abundant, the usefulness on these two boundary nodes accesses the separately high priority carrier wave of boundary node per family, just can guarantee that the user of boundary node access is in different carrier, avoids co-channel interference.Even because carrier resource is limited, certain customers' access lower priority carriers is arranged, but the co-channel interference that accesses between the user of high priority carrier wave can be avoided still.
In this step, also relate to RNC and how to judge that UE is from the problem of boundary node access.The UE initial access process is as shown in Figure 7 among the present invention:
Step a, UE reports the RRC_Connection_Setup_Req request by PRACH to RNC;
Step b after NodeB receives PRACH, estimates the node at PRACH place to PRACH;
Step c, NodeB is with the node information notification RNC at PRACH place;
Steps d when RNC obtains RRC_Connection_Setup_Req, is learnt the nodal information at UE place from NodeB, also be the nodal information of UE access;
Step e, RNC are that UE carries out the resource distribution according to corresponding access criterion, comprise carrier resource.
By above-mentioned initial access process as seen, carry out estimation and the notice RNC of UE access node by NodeB, like this, RNC just can obtain the nodal information of UE access, when this nodal information shows that UE accesses from boundary node, RNC can determine that just UE is accessed by boundary node, then carries out carrier resource at step e according to the setting of above-mentioned carrier wave priority and distributes.
So far, the most basic resource allocation methods flow process finishes among the present invention.By setting and the access control of above-mentioned available carrier wave and carrier wave priority, can avoid the co-channel interference of adjacent distributions formula residential quarter as far as possible, and can improve cell throughout.
Above-mentioned is the basic resource allocation methods flow process that comprises access control.On this basic procedure basis, can also make further improvements in access control, interchannel switching and minizone switching, to disturb between further reduction distributing cell.
Particularly, for admission control process, aforementioned what provide is when UE access boundary node, carries out carrier resource according to the carrier wave priority of this boundary node and distributes.On this distribution principle basis, can also carry out allocation of carriers with reference to following principle further:
1) for the UE that carries out the carrier resource space division multiplexing (for example HSDPA UE), when the access distributing cell, RNC is the different UEs of the same node of access, the carrier resource that priority allocation is different, to reach best space division multiplexing effect, improve cell throughout;
2) for the UE that does not carry out the carrier resource space division multiplexing (for example R4UE), RNC is corresponding UE distributing carrier wave resource according to the principle of balanced each carrier load; For example as R4UE during in the access of non-boundary node, may be thought of as this UE priority allocation is set to low priority at boundary node carrier resource, leave more high priority resource to the UE of boundary node with assurance.
Preferably, between node, in the switching flow, also can the setting of reference carrier priority carry out the switching of carrier wave on the respective nodes.Particularly, when the UE in the distributing cell moves to arbitrary boundary node from non-boundary node, if carrier wave is for being set to the carrier wave of low priority under this UE in this arbitrary boundary node, then RNC can consider this UE is switched on the high priority carrier wave of this arbitrary boundary node, at utmost to eliminate co-channel interference.
Wherein, judge UE from non-boundary node move to arbitrary boundary node mode can for: the strongest node of this UE becomes arbitrary boundary node by non-boundary node, determines that then UE moves to boundary node from non-boundary node.
Suppose that UE moves to boundary node A by non-boundary node C, if when then not having enough resources to distribute to this UE on the high priority carrier wave of boundary node A, RNC can discharge a part of resource from the carrier wave identical with boundary node high priority carrier wave on other non-boundary nodes, thereby this UE is switched on the high priority carrier wave of boundary node A.During concrete releasing resource, other UE that are positioned on other arbitrary non-boundary nodes and take the high priority carrier resource of boundary node A can be switched on this non-boundary node, take on the carrier wave of the upper low priority of boundary node A.
Preferably, when switching in the minizone, switch the problem of co-channel interference that brings in order further to eliminate the minizone, UE can be switched to the high priority carrier wave of the corresponding boundary node of Target cell.
When a Target cell had a plurality of boundary node, RNC need to obtain the information that UE moves to which boundary node of Target cell.When the high priority carrier wave of a plurality of borders passage not simultaneously, need to arrange according to the carrier wave priority of the object boundary node of Target cell for UE carrier wave is set.
For addressing the above problem, the carrier wave priority attribute can be set in the adjacent cell list of each residential quarter in RNC in advance, be used for preserving the priority attribute of each available carrier wave on this adjacent cell boundary node adjacent with this residential quarter; When carrying out the minizone switching, the carrier wave priority attribute that arranges in the adjacent cell list of RNC according to the cell-of-origin is UE distributing carrier wave resource.
For example in the networking schematic diagram shown in Figure 5, in RNC, preserve in advance the adjacent cell list of Cell 1, wherein preserve the carrier wave priority attribute of the adjacent boundary node of each adjacent cell and Cell 1 in this adjacent cell list, for example in the tabulation of Cell 2, preserve the carrier wave priority attribute of the boundary node B adjacent with Cell 1.When UE moved to Cell 2 by Cell 1, the carrier wave priority attribute (being the carrier wave priority attribute of B node) that Cell2 preserves in the adjacent cell list of Cell 1 was UE distributing carrier wave resource.
By the processing of switching between access control in the invention described above, residential quarter interior nodes, switch the minizone, can avoid as far as possible the co-channel interference between distributing cell, simultaneously, because each carrier resource in the non-boundary node can distribute arbitrarily, therefore can greatly improve the throughput of residential quarter.
Being preferred embodiment of the present invention only below, is not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the carrier wave resource allocation method of a UE is characterized in that, the method comprises:
For the system that is made of a plurality of distributing cells, when carrying out the network planning, for each node in each described distributing cell, all carrier waves of RNC are set to its available carrier wave; For the boundary node in each distributing cell, RNC is divided into high and low two carrier wave priority with its available carrier wave, and for any two adjacent boundary nodes, the carrier wave that is set to high priority thereon is different; For other the non-boundary nodes except the node of border, its available carrier wave does not arrange carrier wave priority;
When UE accessed from arbitrary boundary node, RNC was described UE distributing carrier wave resource according to the carrier wave priority of this arbitrary boundary node.
2. method according to claim 1 is characterized in that, for the UE that uses the space division multiplexing resource, when the arbitrary described distributing cell of access, RNC is the different UEs of the same node of access, the carrier resource that priority allocation is different.
3. method according to claim 1 is characterized in that, for the UE that does not carry out the carrier resource space division multiplexing, RNC is described UE distributing carrier wave resource according to the principle of balanced each carrier load.
4. method according to claim 3 is characterized in that, when the described UE that does not carry out the carrier resource space division multiplexing accessed from non-boundary node, RNC was described UE priority allocation is set to low priority at boundary node carrier resource.
5. arbitrary described method in 4 according to claim 1, it is characterized in that, RNC determines that UE from the mode of described boundary node access is: the information that NodeB uploads by PRACH according to UE, described PRACH is estimated to determine the passage at PRACH place, and the channel information of determining is sent to RNC.
6. method according to claim 1 is characterized in that, the method further comprises:
When the UE in the distributing cell moved to arbitrary boundary node from non-boundary node, if carrier wave is for being set to the carrier wave of low priority under this UE in this arbitrary boundary node, then RNC switched to this UE on the high priority carrier wave of this arbitrary boundary node.
7. method according to claim 6 is characterized in that, RNC determines that the UE in the distributing cell from the mode that non-boundary node moves to arbitrary boundary node is: the strongest node of this UE becomes described arbitrary boundary node by described non-boundary node.
8. according to claim 6 or 7 described methods, it is characterized in that, when not having enough resources to distribute to described UE on the high priority carrier wave of described arbitrary boundary node, RNC distributes to described UE from being positioned on arbitrary non-boundary node and releasing resource on the carrier resource identical with the high priority carrier wave of described arbitrary boundary node.
9. according to claim 1 or 6 described methods, it is characterized in that, the method further comprises:
When the arbitrary UE in the described distributing cell residential quarter occurs switched, RNC switched to this UE on the high priority carrier wave on the object boundary node of Target cell; Described Target cell is distributing cell.
10. method according to claim 9, it is characterized in that, the method further comprises: the carrier wave priority attribute is set in the adjacent cell list of each residential quarter in RNC in advance, is used for preserving the priority attribute of each available carrier wave on this adjacent cell boundary node adjacent with this residential quarter;
Described RNC switches to this UE on the high priority carrier wave on the object boundary node of Target cell: the carrier wave priority attribute that arranges in the adjacent cell list of described RNC according to the cell-of-origin is described UE distributing carrier wave resource; Described each residential quarter and described cell-of-origin are distributing cell.
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| CN 200910243872 CN102111769B (en) | 2009-12-24 | 2009-12-24 | Carrier resource allocation method for user equipment (UE) |
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| CN102325376A (en) * | 2011-09-09 | 2012-01-18 | 大唐移动通信设备有限公司 | Carrier resource distributing method and device |
| EP3127360B1 (en) | 2014-04-01 | 2020-01-22 | Telefonaktiebolaget LM Ericsson (publ) | User equipment and access node and respective methods |
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| CN101018220B (en) * | 2006-02-09 | 2011-02-16 | 华为技术有限公司 | Implementation method and device for avoiding the interference between the cells |
| US8009581B2 (en) * | 2006-06-12 | 2011-08-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Method in a scheduler for reducing inter-cell interference |
| CN101212764B (en) * | 2006-12-27 | 2011-09-28 | 大唐移动通信设备有限公司 | Frequency point allocation method and wireless network controller |
| CN101227695A (en) * | 2007-01-16 | 2008-07-23 | 华为技术有限公司 | Apparatus and method for distributing district communication resource |
| EP2140708B1 (en) * | 2007-03-30 | 2017-05-24 | Telecom Italia S.p.A. | Method and system for enabling connection of a mobile communication terminal to a radio communication network |
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