CN100473225C - Resource distributing method for asymmetric bandwidth ability radio network switch-in system - Google Patents
Resource distributing method for asymmetric bandwidth ability radio network switch-in system Download PDFInfo
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- CN100473225C CN100473225C CNB2006100795983A CN200610079598A CN100473225C CN 100473225 C CN100473225 C CN 100473225C CN B2006100795983 A CNB2006100795983 A CN B2006100795983A CN 200610079598 A CN200610079598 A CN 200610079598A CN 100473225 C CN100473225 C CN 100473225C
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Abstract
A method for distributing resource of radio network access system with asymmetric band width ability includes confirming minimum band width ability of user device, calculating out effective sub carrier number N corresponding to minimum band width ability of user device and using divisor of effective sub carrier number N as unit to divide total effective sub carrier to be multiple group, using said group as system to distribute one or multiple group effective sub carrier to user device by radio access device in order to carry out communication as distributed effective sub carrier number being not less than N.
Description
Technical field
The present invention relates to the wireless network access scheme of asymmetric bandwidth ability, relate in particular to a kind of resource allocation methods of wireless network access scheme of asymmetric bandwidth ability.
Background technology
As a kind of multi-carrier transmission pattern, OFDM (OFDM) is converted to one group of low-speed parallel data flow transmitted by the data flow with a high-speed transfer, and system is reduced greatly to the susceptibility of multidiameter fading channel frequency selectivity; The introducing of Cyclic Prefix (CP) has further strengthened the ability of the anti-intersymbol interference of system (ISI) again; In addition bandwidth availability ratio height, realize characteristics such as simple, make OFDM more and more wider in the application of wireless communication field.
The OFDM technology successfully has been applied in many communication systems, and for example, digital broadcasting (DAB) and Digital Television (DVB) by european telecommunications standards institute ETSI formulates all adopt the wireless transmission standards of OFDM technology as air interface.In addition, WLAN standard IEEE 802.11 and wireless metropolitan area network standard IEEE 802.16 have also adopted the OFDM technology.Effective use of OFDM technology needs receiving-transmitting sides strictly time synchronized and carrier synchronization.
Because ofdm system is divided into a lot of little subcarriers with frequency range, typical subcarrier length can be designed as 15kHz, and this just makes fine-grained frequency domain resource be divided into possibility.Thereby, make the bandwidth that the bandwidth ability of UE can provide less than connecting system.For example, Fig. 1 has provided an example of this method, wherein, and the bandwidth that the UE bandwidth provides less than connecting system, the part that UE can only the treatment system bandwidth.Since in the ofdm signal, the complete quadrature of different subcarriers, and the subcarrier under the treatable bandwidth of UE is not subjected to the influence of other subcarrier of system bandwidth.Because the UE of low bandwidth ability has lower implementation complexity, this makes the UE cost to be effectively controlled.In addition, can at the band center of ofdm system downlink, select the position of the continuous sub-carriers of some that synchronizing signal is set by this characteristic.
For ofdm system, its effective subcarrier is for only taking the mid portion certain proportion scope of system physical frequency range.If this ratio is X%, the effective sub-subcarrier that then inserts the UE of this system takies X%UE physics frequency range.System/unappropriated part in UE physics frequency range both sides is called boundary belt, is virtual subcarrier.All refer to effective subcarrier as unexplained reference among the present invention.
When OFDM was applied to the cellular wireless mobile communication system, UE can switch between different wireless access websites, as shown in Figure 2.But, when little bandwidth subscriber equipment switches between different wireless access websites, how to make UE can receive data simultaneously, become the problem that needs solve.For the UE of little bandwidth ability, the subcarrier of reception may not comprise the synchronizing signal of system centre.Like this, when UE reselected the wireless access website, the Data Receiving of UE may of short durationly be interrupted.For voice or VoIP business, the greatly low quality of service that reduces of such interruption meeting.Therefore, need a kind of resource allocation methods of optimizing bandwidth ability less than the performance of the UE of system bandwidth.
Summary of the invention
Technical problem to be solved by this invention is, a kind of resource allocation methods of wireless network access scheme of asymmetric bandwidth ability is provided, by rationally carrying out resource allocation, make that UE can receive data simultaneously when little bandwidth UE switched between different radio access website for little bandwidth UE.
The invention provides a kind of resource allocation methods of wireless network access scheme of asymmetric bandwidth ability, comprise the steps:
(1) determines the minimum bandwidth capabilities of subscriber equipment, and, calculate effective sub-carrier number N of the minimum bandwidth capabilities correspondence of described subscriber equipment according to the shared bandwidth ratio of the effective subcarrier of system and the bandwidth of each subcarrier;
(2) approximate number with non-1 and the non-N of described effective sub-carrier number N is a unit,, determine the subcarrier number S that each group should contain, effective subcarrier total in the system bandwidth is divided into a plurality of groups of G:
(3) during system communication, radio reception device is an organizational system with described group, and for one or more groups effective subcarrier of user equipment allocation is used for communication, effective sub-carrier number of described distribution is not less than N.
In the described step (2), the order that total effective subcarrier is divided in the system bandwidth is the sequence arrangement according to the residing frequency height of subcarrier.When being divided into last group, allow this remaining sub-carrier number less than every group of sub-carrier number that comprises.In the step (2), described approximate number is 2.
Described step (3) comprising:
When subscriber equipment was in the state of normal reception data, radio reception device was one or more groups effective subcarrier of user equipment allocation arbitrarily in the system bandwidth scope.
Described step (3) also comprises:
When subscriber equipment was in the state of normal reception data, radio reception device was the best effective subcarrier of one or more groups frequency resource of user equipment allocation in the system bandwidth scope.
Described step (3) comprising:
When subscriber equipment need switch, send handoff request to radio reception device, the request of radio reception device response UE, UE enters switching state;
This radio reception device sends before the handoff response or simultaneously, according to the sub-carrier positions that carries synchronizing signal, is one or more groups subcarrier of user equipment allocation to subscriber equipment, includes the subcarrier of described carrying synchronizing signal in the subcarrier of described distribution.
Wherein, when described subscriber equipment enters switching state, when using one or more groups subcarrier that distributes to receive data, search for also the synchronizing signal of neighbor cell radio reception device synchronously, after the success, insert the radio reception device of this neighbor cell synchronously.
In the method for the invention, the effective subcarrier of described many groups is continuous.
Use method of the present invention and obtain the dividing mode of Resource Block, the Resource Block of dividing out can be so that when UE bandwidth during less than the radio reception device bandwidth, the schedule information that UE can send according to radio reception device, the data of two or more continuous resource pieces of demodulation.This makes wireless device to specify best frequency resource for UE, and when UE was in switching state, when this UE can receive data, it was synchronous to do neighbor cell, thereby had guaranteed the continuity of downlink data.
Description of drawings
Fig. 1 is the WAP (wireless access point) of ofdm system and the corresponding relation between the UE subcarrier;
State transition graph when Fig. 2 is Cell searching;
Fig. 3 is the flow chart according to the resource allocation methods of the embodiment of the invention;
Fig. 4 is the flow chart of UE being dispatched according in the resource allocation methods of the embodiment of the invention;
Fig. 5 is the use schematic diagram of application apparatus of the present invention;
Fig. 6 is the flow chart of scheduling UE among the embodiment 1;
Fig. 7 is the present invention dispatches UE in the subcarrier scope of radio reception device a schematic diagram.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing, will be elaborated to described method of the present invention.
When between different radio access website, switching in order to solve little bandwidth UE, UE can receive the technical problem of data simultaneously, the invention provides a kind of resource allocation methods of wireless network access scheme of asymmetric bandwidth ability, be used for the allocation of downlink frequency spectrum resource, as shown in Figure 3, described method mainly comprises the steps:
Step 310: determine the minimum bandwidth capabilities of subscriber equipment, and, calculate effective sub-carrier number N of the minimum bandwidth capabilities correspondence of described subscriber equipment according to the shared bandwidth ratio of the effective subcarrier of system and the bandwidth of each subcarrier.
At first, determine the minimum bandwidth capabilities of user equipment (UE), for example the bandwidth of UE can be got 10MHz, ratio according to the shared bandwidth of the effective subcarrier of system, and the bandwidth of each subcarrier (for example 15kHz), can obtain the pairing effective sub-carrier number N of minimum bandwidth capabilities of UE, promptly
The bandwidth of N=(UE minimum bandwidth capabilities * effective shared bandwidth ratio of subcarrier)/each subcarrier.
Step 320: the approximate number with described effective sub-carrier number N is a unit, and effective subcarrier total in the system bandwidth is divided into a plurality of groups;
The wide M of being of the regiment commander that sets up departments an effective subcarrier, the wherein bandwidth of M=(system bandwidth * effective shared bandwidth ratio of subcarrier)/each subcarrier.UE aims at X subcarrier of the downstream signal of WAP (wireless access point) when receiving data, wherein, X always is less than or equal to M, and the X value of the UE that system can insert is minimum to be N, i.e. N≤X≤M.
Can use following formula that system bandwidth is divided into G group,
At first, calculate the subcarrier number S that determines that each group should contain, when the formula above utilizing calculated, used approximate number can be 2; Then, utilize the group that the individual effectively subcarrier of M can be divided in the S computing system bandwidth to count G again.Like this, except that last group, each group contains S subcarrier.The order that total effective subcarrier is divided in the system bandwidth is the sequence arrangement according to the residing frequency height of subcarrier.Wherein, when being divided into last group, allow this remaining sub-carrier number less than every group of sub-carrier number that comprises,
Step 330: during system communication, radio reception device is an organizational system with described group, and for one group of user equipment allocation is used to communicate by letter with the effective subcarrier of many groups, effective sub-carrier number of described distribution is not less than N.
The characteristics of resource allocation methods of the present invention are in order to make the usefulness of searching for other websites again reach maximum, to need to guarantee that minimum bandwidth capabilities UE can place frequency acceptance band the central authorities or the approximate part of band system band.Number of sub carrier wave in group, be chosen near the sub-carrier number purpose of minimum bandwidth capabilities UE half, so, be unit at approximate number with described effective sub-carrier number N, when effective subcarrier total in the system bandwidth was divided into a plurality of groups, should choose described approximate number was 2 as far as possible.
Further, this resource allocation methods is the situation particularly suitable of 2 multiple and the system subcarrier number 2^k multiple that is the UE subcarrier to the UE sub-carrier number, makes the number of every group of subcarrier equate, so that scheduling.
As shown in Figure 4, based on above-described resource allocation methods, the present invention further can comprise a kind of scheduling strategy in described step 330, mainly may further comprise the steps:
Step 410: when subscriber equipment was in the state of normal reception data, radio reception device was one or more groups effective subcarrier of user equipment allocation arbitrarily in the system bandwidth scope.
This makes UE to receive data in the band transmission scope of radio reception device by scheduling, wherein, radio reception device is one or more groups effective subcarrier of user equipment allocation arbitrarily in the system bandwidth scope, can be the best effective subcarrier of one or more groups frequency resource.
Step 420: when subscriber equipment need switch, send handoff request to radio reception device;
As shown in Figure 2, when subscriber equipment need switch, send handoff request to radio reception device, the request of radio reception device response UE, UE enters switching state.
Step 430: this radio reception device sends before the handoff response or simultaneously to subscriber equipment, according to the sub-carrier positions that carries synchronizing signal, be one or more groups subcarrier of user equipment allocation, include the subcarrier of described carrying synchronizing signal in the subcarrier of described distribution.
Before UE sends handoff response or in its while, being the mode of one or more groups subcarrier of user equipment allocation at access device, can be two groups of subcarriers that are registered to the centre of system bandwidth by the reception subcarrier of this UE of scheduling indication.
Step 440:UE searches other synchronizing channel with the radio reception device of frequency range, synchronously success.Be linked into this radio reception device then.
Further, said method also can have following characteristics: in step 410, allow the UE of little bandwidth ability the subcarrier of its processing can be placed on two sub carrier group of any 2 adjacency.Access device is notified UE by dispatch, and UE carries out data demodulates in these two sub carrier group of appointment.This mode has guaranteed the flexibility that UE dispatches to a great extent in frequency domain.
Further, said method also can have following characteristics: in step 410, if satisfy multiple relation, i.e. M=c1 * S between M, N and the S, N=c2 * S wherein c1 and c2 is an integer, and minimum bandwidth capabilities UE can receive any one subcarrier of radio reception device so.If there is not the multiple relation between N and S, and M mod S ≠ N mod S, S subcarrier of the N mod of minimum bandwidth capabilities UE can't be dispatched valid data.
Further, said method also has following characteristics: in step 430, when UE has entered switching state, UE can be in the data of demodulation center frequency-band, the search and the synchronizing signal of the center frequency-band of neighbor cell synchronously.
Embodiment 1:
As shown in Figure 5, be the connecting system schematic diagram of the embodiment of the invention, wherein, comprise radio reception device and hand-held consumer devices thereof (UE).
In the present embodiment, the bandwidth ability of radio reception device is 20MHz.But the bandwidth ability value of UE is 10MHz or 20MHz.Frame structure with 3GPP LTE standard is reference, and system's shared bandwidth of effective subcarrier is 90%, and each subcarrier is 15kHz.Number for the effective subcarrier of radio reception device is M=1200, takies the 18MHz bandwidth.For the UE of 10MHz, i.e. minimum bandwidth capabilities 10MHz, effectively subcarrier is N=600, takies the 9MHz bandwidth.
In the present embodiment, system bandwidth is a M=1200 effectively subcarrier, when UE receives data, aims at X subcarrier of the downstream signal of WAP (wireless access point), and X always is less than or equal to M.The X value of the UE that system can insert is minimum to be N.Use following formula that system bandwidth is divided into the G group.Wherein
Except that last group, each group contains S subcarrier.The sequencing of subcarrier is arranged according to the height of the residing frequency of subcarrier.
In the present embodiment, calculate G=4 according to above-mentioned formula, S=300.Just, for the radio reception device of 20MHz, all subcarriers are divided into 4 groups, and each group contains 300 subcarriers.Like this, even 10MHz UE also can receive the subcarrier of any one group of 4 groups of radio reception device downlink.The subcarrier that UE received of any ability is continuous.
In the present embodiment, radio reception device is separate at the descending control signaling of different sub carrier group.The encoding rate of the descending control signaling in the different sub carrier group, the power setting of order of modulation and signal is separate.
The method of the resource allocation of carrying out based on above subcarrier packet mode, radio reception device dispatches one group or a plurality of continuous group subcarriers for different UE, when UE began to switch to another radio reception device, radio reception device was originally dispatched the center that this UE aims at downstream bands.Its idiographic flow may further comprise the steps as shown in Figure 6:
Step 610, the state when UE is in normal reception data can receive data in the band transmission scope of radio reception device by scheduling.
Step 620 when UE need switch, is sent handoff request to radio reception device;
Step 630, access device are registered to two groups of subcarriers of the centre of system bandwidth by the reception subcarrier of this UE of scheduling indication before UE sends handoff response or in its while.
Step 640, UE searches other synchronizing channel with the radio reception device of frequency range, synchronously success.Be linked into this radio reception device then.
As shown in Figure 7, provided the present invention dispatches UE in the subcarrier scope of radio reception device schematic diagram.1200 subcarriers have been divided into 4 groups among Fig. 7.The synchronizing signal of system has just been crossed over two middle sub carrier group in the middle of frequency band.UE normally receives under the state of data, and UE can select any 2 adjacent group of received data in 4 sub carrier group.
Utilize above-described embodiment method, those skilled in the art is easy to be made at conversion such as the sub-carrier positions, modulation system of bandwidth, the synchronizing channel of sub-carrier number, the subcarrier of wireless device sub-carrier number, minimum bandwidth capabilities UE, those skilled in the art that should understand, the above is preferred embodiment of the present invention only, is not to be used for limiting practical range of the present invention; Everyly do equivalence according to the present invention and change and revise, all contained by claim of the present invention.
For example: in another embodiment, the sub-carrier number of minimum bandwidth capabilities UE is 300.Then every group contains 150 subcarriers, and the subcarrier of the downlink of 20M radio reception device is divided into 8 groups.
For example: in another embodiment, when the modulation system of the downstream signal of 20M radio reception device for through preliminary treatment OFDM system, that is, be that method by pre-filtering produces in the parallel data of OFDM modulation.The principle of subcarrier grouping still is applied to dispatching method as above equally.
Claims (8)
1, a kind of resource allocation methods of wireless network access scheme of asymmetric bandwidth ability is characterized in that, comprises the steps:
(1) determines the minimum bandwidth capabilities of subscriber equipment, and, calculate effective sub-carrier number N of the minimum bandwidth capabilities correspondence of described subscriber equipment according to the shared bandwidth ratio of the effective subcarrier of system and the bandwidth of each subcarrier;
(2) approximate number with non-1 and the non-N of described effective sub-carrier number N is a unit, determines the subcarrier number S that each group should contain, and effective subcarrier M total in the system bandwidth is divided into a plurality of groups of G:
(3) during system communication, radio reception device is an organizational system with described group, and for one or more groups effective subcarrier of user equipment allocation is used for communication, effective sub-carrier number of described distribution is not less than N, and is not more than M.
2, the method for claim 1 is characterized in that, in the described step (2), the order that total effective subcarrier is divided in the system bandwidth is the sequence arrangement according to the residing frequency height of subcarrier.
3, the method for claim 1 is characterized in that, in the described step (2), when being divided into last group, allows remaining sub-carrier number less than every group of sub-carrier number that comprises.
4, the method for claim 1 is characterized in that, described step (3) comprising:
When subscriber equipment was in the state of normal reception data, radio reception device was one or more groups effective subcarrier of user equipment allocation arbitrarily in the system bandwidth scope.
5, the method for claim 1 is characterized in that, described step (3) comprising:
When subscriber equipment was in the state of normal reception data, radio reception device was the best effective subcarrier of one or more groups frequency resource of user equipment allocation in the system bandwidth scope.
6, the method for claim 1 is characterized in that, described step (3) comprising:
When subscriber equipment need switch, send handoff request to radio reception device;
This radio reception device sends before the handoff response or simultaneously, according to the sub-carrier positions that carries synchronizing signal, is one or more groups subcarrier of user equipment allocation to subscriber equipment, includes the subcarrier of described carrying synchronizing signal in the subcarrier of described distribution.
7, method as claimed in claim 6, it is characterized in that, when described subscriber equipment enters switching state, when using one or more groups subcarrier that distributes to receive data, the synchronizing signal of search and synchronous neighbor cell radio reception device, after the success, insert the radio reception device of this neighbor cell synchronously.
As claim 1,4,5,6 or 7 described methods, it is characterized in that 8, the effective subcarrier of described many groups is continuous on frequency.
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| CN101202578B (en) * | 2006-12-13 | 2012-01-25 | 大唐移动通信设备有限公司 | Method and system for transmitting data in quartered frequency-division multiplex system |
| US9137075B2 (en) * | 2007-02-23 | 2015-09-15 | Telefonaktiebolaget Lm Ericsson (Publ) | Subcarrier spacing identification |
| CN101272615B (en) * | 2007-03-22 | 2012-09-05 | 中兴通讯股份有限公司 | Transmission method and device for resource position field in resource allocation signaling |
| CN101388870B (en) * | 2007-09-12 | 2012-05-09 | 中兴通讯股份有限公司 | Resource allocation signaling generating method based on OFDM system |
| WO2009086659A1 (en) * | 2007-12-29 | 2009-07-16 | Zte Corporation | A synchronization method of terminal in large bandwidth wireless communication system and a frame structure |
| CA2750580C (en) * | 2009-01-30 | 2016-05-10 | Samsung Electronics Co., Ltd. | Control signaling for transmissions over contiguous and non-contiguous frequency bands |
| CN101902781B (en) * | 2010-08-02 | 2013-09-11 | 华为技术有限公司 | Nonstandard bandwidth implementation method and device |
| CN113038540A (en) | 2016-07-26 | 2021-06-25 | Oppo广东移动通信有限公司 | Signal transmission method and device |
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