CN108093479A - A kind of method for promoting LTE system upstream rate - Google Patents
A kind of method for promoting LTE system upstream rate Download PDFInfo
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- CN108093479A CN108093479A CN201611042257.9A CN201611042257A CN108093479A CN 108093479 A CN108093479 A CN 108093479A CN 201611042257 A CN201611042257 A CN 201611042257A CN 108093479 A CN108093479 A CN 108093479A
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- terminal
- uplink
- pusch
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
This application discloses it is a kind of promoted LTE system upstream rate method, including：Judge whether terminal has been allocated for sending the ascending resource of Uplink Shared Channel UL SCH data in present sub-frame；If terminal is not previously allocated to send the ascending resource of UL SCH data in present sub-frame, then the construction pre- UL Grant of carrying out uplink pre-scheduling mandate in base station are sent to the terminal, and, Physical Uplink Control Channel PUCCH resource is not configured for the terminal, corresponding resource block RB resources are used to Physical Uplink Shared Channel PUSCH.Using technical solution disclosed in the present application, the upstream rate of LTE system can be promoted.
Description
Technical field
This application involves mobile communication technology field, more particularly to a kind of method for promoting LTE system upstream rate.
Background technology
In LTE (Long Term Evolution, Long Term Evolution) system, PUCCH (Physical Uplink
Control Channel, Physical Uplink Control Channel) effect be summarized as follows：
Terminal needs to send necessary uplink L1/L2 control information to support uplink and downlink data transmission.Uplink L1/L2 is controlled
Information (Uplink Control Information, UCI) includes：
SR (Scheduling Req, scheduling request)：For terminal to base station requests Uplink Shared Channel (UL-SCH)
Resource.
HARQ ACK/NACK (hybrid automatic repeat-request confirmation/non-acknowledgement)：To in PDSCH (Physical
Downlink Share Channel, Physical Downlink Shared Channel) on the downlink data that sends carry out HARQ confirmations.
·CSI：Channel State Information (channel state information), including CQI (channel quality instruction),
The information such as PMI (pre-coding matrix instruction), RI (order instruction), for notifying base station down channel quality etc., with help base station into
Row descending scheduling.CSI report can be configured to periodically it is (periodic) or acyclic (aperiodic).
Since scheduling is realized in base station side, relevant information (Resource block are distributed with ascending resource
Assignment (resource block distribution), MCS (modulation and coding strategy) etc.) it is that by UL grant, (uplink scheduling is awarded by base station
Power) notice terminal, and corresponding UL grant, it is that fixed (correspondence is shown in that terminal sends data in which sub-frame of uplink
The Table 8-2 of 3GPP36.213 agreements), therefore, base station knows terminal will be in which RB (resource block) of which sub-frame of uplink
It is upper which kind of MCS to send data using, without terminal notification base station.
PUCCH is commonly configured on frequency domain positioned at the edge of up-link bandwidth.One PUCCH is in uplink
2 time slots (slot) are accounted in frame, 1 slot is 1ms, and each slot accounts for 12 subcarriers (subcarrier) on frequency domain, i.e., 1
A RB.In order to provide frequency diversity, PUCCH is in the border of slot " frequency hopping "：I.e. in same subframe, PUCCH former and later two
The PRB resources of slot are located at the both ends (this 2 PRB constitute a RB to (RB pair)) of available frequency spectrum resource respectively, and
Intermediate monoblock frequency spectrum resource is used for transmission PUSCH.It is such to design the frequency diversity gain for being capable of providing PUCCH.
Even if terminal is not previously allocated any UL-SCH resources, terminal may also need to send ascending control information.According to
Whether terminal has been allocated that uplink UL-SCH resources, and LTE defines 2 kinds of different modes for sending uplink L1/L2 controls
Information processed.
If the 1, terminal is not previously allocated to send the ascending resource of UL-SCH data in present sub-frame, terminal uses
PUCCH sends uplink L1/L2 control information.
If the 2, terminal is assigned to send the ascending resource of UL-SCH data in present sub-frame, terminal uses
PUSCH sends uplink L1/L2 control information.If terminal has been allocated that UL-SCH resources, SR need not be just retransmited
.Aperiodicity CSI can only be transmitted on PUSCH.
It is also more and more using the scene demand of small bandwidth with widely using for LTE system.3M system bandwidths have
15RB, 1.4M system bandwidth only have 6RB.
In the small bandwidth (such as bandwidth only has 6RB) that RB resources are so nervous, terminal is monopolized in a subframe
One RB pair sends PUCCH too waste of resource, and a RB pair is exactly 2 RB.
From 36.213 agreement Table 7.1.7.2.1-1 of 3GPP, in the case where MCS is determined, transmittable number is dispatched
It can be inquired about according to amount (bit).The RB numbers of current sub-frame of uplink PUSCH scheduling=total RB numbers-PUCCH occupies RB numbers-PRACH and occupies RB
Number.RB numbers are expanded into 10ms and 1s, with regard to upstream rate can be obtained.Wherein, PRACH is Physical Random Access Channel.
By taking TDD-LTE 1.4M bandwidth (6 RB) as an example, subframe proportioning 1, special subframe proportioning 7, sub-frame of uplink, which transmits, to be had
2、3、7、8.Assuming that Physical Random Access Channel (PRACH) once and with subframe 8 in (fixed to occupy 6 RB) 10ms.MCS28
The corresponding transport block size of rank (TBS) is 26.
Table 1
Because PUCCH at least occupies a RB pair, i.e. 2 RB, so the maximum PUSCH scheduling that upstream rate uses
RB numbers be 4.According to table 1, when PUCCH resource number configures 2 RB of minimum, upstream rate 895.2K.
Analysis understands that, if configuring more PUCCH resources, upstream rate will not rise to drop instead.So believe in system
It makes an uproar than in the case of encoding stable, it is relatively difficult that rate is promoted by the way of current.
The content of the invention
This application provides a kind of method for promoting LTE system upstream rate, to promote the upstream rate of LTE system.
This application provides it is a kind of promoted LTE system upstream rate method, including：
Judge whether terminal has been allocated for sending the uplink money of Uplink Shared Channel UL-SCH data in present sub-frame
Source；
If terminal is not previously allocated to send the ascending resource of UL-SCH data in present sub-frame, and requires transmission
During the demand of L1/L2 control information, then base station construction carrying out uplink pre-scheduling mandate (UL Grant) goes to realize, only terminal is used
The upstream data that PUSCH is sent is padding (the empty bag of MAC PDU), and the data that base station receives are also that (MAC PDU are empty by padding
Bag).It does not configure, without using PUCCH resource, the uplink L1/L2 control information of transmission can also be transferred to base station.
Preferably, terminal sends data and uplink L1/L2 control information on the PUSCH.
Preferably, terminal is invalid with the PUSCH upstream datas sent according to the pre- UL Grant, what base station received
Corresponding data are invalid.
As seen from the above technical solution, the method for the promotion LTE system upstream rate that the application provides, first determines whether terminal
Whether it has been allocated for sending the ascending resource of UL-SCH data in present sub-frame；If terminal is not divided in present sub-frame
The ascending resource for sending UL-SCH data is used in, then base station constructs pre- UL Grant and is sent to the terminal, also, is not to be somebody's turn to do
Terminal configures PUCCH resource, corresponding RB resources is used to PUSCH, so as to be obviously improved the upper scanning frequency of LTE system
Rate.
Description of the drawings
Fig. 1 is an exemplary resources position view of the invention；
Fig. 2 is the flow diagram of a preferred base station decision-making scheduling authorization of the invention；
Fig. 3 is an exemplary timing relationship schematic diagram of the invention.
Specific embodiment
Object, technical solution and advantage to make the application are more clearly understood, and develop simultaneously embodiment referring to the drawings, right
The application is described in further detail.
From shannon formula C=Blog2 (1+S/N), under system signal noise ratio and coding techniques stable case, only
Channel capacity could be improved by improving B.Wherein, C is channel capacity, and B is channel width (hertz), and S is signal power (watt), and N is
Noise power (watt).
The scene of small bandwidth has upstream rate higher demand, and in order to effectively utilize bandwidth resources, the present invention uses
It does not configure, the mode without using PUCCH resource, saves PUCCH resource expense, the RB resources vacateed are used to PUSCH, so as to
Upstream rate can be made to have a distinct increment.As shown in table 2, when not configuring PUCCH resource, upstream rate can reach 1.3176M.
Table 2
Therefore, the RB resources that PUCCH resource is vacateed are also bigger, and for PUSCH using the also more of RB, upstream rate is promoted
Effect is more apparent.
Since not configuring, without using PUCCH resource, the uplink L1/L2 control information of transmission but will also be transferred to base station,
How to realizeHow to accomplish that, without using PUCCH, the functional characteristic of system is also substantially unaffected or influences very little
As described in agreement, after network is accessed, terminal is assigned to send UL-SCH numbers in present sub-frame terminal
According to ascending resource, then terminal send uplink L1/L2 control information, i.e. L1/L2 control signalings and data-reusing using PUSCH
PUSCH。
It understands, LTE supports one kind without using PUCCH and uses PUSCH transmission L1/L2 control information, but precondition is
Terminal is assigned to send the ascending resource of UL-SCH data in present sub-frame.
Based on above analysis, the application proposes a kind of method for promoting LTE system upstream rate, and main thought is：
If terminal is not previously allocated to send the ascending resource of UL-SCH data in present sub-frame, base station is structurally
Row pre-scheduling mandate is (hereinafter referred to as：Pre- UL Grant) it goes to realize, but terminal is invalid with the PUSCH upstream datas sent
, the data that base station receives are also useless.
Pass through aforesaid operations so that terminal obtains carrying out uplink pre-scheduling mandate in present sub-frame, so as to which terminal can just use
PUSCH sends data, while also sends uplink L1/L2 control information, and control information is less, seldom accounts for RB resources.
Meanwhile carrying out uplink pre-scheduling mandate simply can increase Physical Downlink Control Channel (PDCCH) Downlink Control Information (DCI)
Frequency.
So far, the RB resources that PUCCH is vacated to PUSCH can just be used, therefore, is bound to improve upstream rate, especially
It is especially prominent to the promotion effect of the LTE system of small bandwidth.
Since without using PUCCH resource, and uplink L1/L2 control information is sent using PUSCH, how to ensure control letter
The transmitting of breath
Associated description has ensured referring to 36.212 agreement of 36.211 agreements of 3gpp and 3gpp.Because this mode
What LTE was allowed for when designing.
CQI/PMI uses the modulation system identical with PUSCH, occupies the high resource location of frequency spectrum.
HARQ ACK/NACK are fed back and RI requires high reliability, so being modulated using BPSK/QPSK.
As shown in Figure 1, there are HARQ ACK/NACK are anti-in former and later two time slots of each subframe according to above-mentioned design
Feedback and RI, such configuration is so that when, there are when frequency hopping, control signaling can obtain frequency gain between time slot.ACK/
NACK is centered around the both sides of DMRS, and ACK/NACK can be caused to obtain most accurate channel estimation.The position of RI is in ACK/NACK
Both sides, even if ACK/NACK is not fed back, RI can not occupy corresponding position.CQI, PMI are placed on PUSCH frequencies and start
Position, be distributed on all symbols removed in PUSCH subframes outside DMRS.
From the perspective of system, only when cell has downlink data that transmission is needed (to be just concerned about down channel at this time
Relevant information) when, it just may require that UE sends aperiodicity CSI and reports.
In conclusion the RB resources that PUCCH is vacated are used to PUSCH, system function and performance are impacted small, if right
Upstream rate has higher pursuit, then this method is not less than for a feasible method.
Due to scheduling be is realized in base station side, the present invention from base station angle description how decision-making scheduling authorization, this
Decision process is as shown in Fig. 2, comprise the following steps：
Step 1：Judge whether current downlink (DL) subframe allows to send UL Grant, if allowing to send UL Grant,
2 are entered step, if not allowing to send UL Grant, jumps to step 7.
Step 2：Judge whether there is upstream data to need to send in corresponding sub-frame of uplink, if there is upstream data needs to send out
It send, jumps to step 5, if no upstream data needs to send, enter step 3.
Step 3：Judge whether corresponding sub-frame of uplink there are the HARQ ACK/NACK for downlink data to need to feed back to base
It stands, if so, continuing step 4.
Step 4, PDCCH constructs pre- UL Grant, jumps to step 6.
Step 5：PDCCH only carries the corresponding mandate of upstream data, because HARQ ACK/NACK feedbacks and upstream data one
It rises and is transmitted by PUSCH.
Step 6：Judge whether PDCCH also has extra CCE positions can use, if there is extra CCE positions can use, continue
Step 7 is performed, if can use without extra CCE positions, terminates this flow.
Step 7：Judge whether eNB has downlink data to need to send, if there is downlink data needs to send, continue step 8.
Step 8：ENB sends downlink data in current downlink subframe, then, terminates this flow.
From the Table 8-2 in 36.213 agreements of 3Gpp, if give terminal receives PDCCH in downlink subframe n
With DCI format 0 then send PUSCH in subframe n+k.Based on this, Fig. 3 gives base station and terminal in the method for the present invention
UL Grant and PSUCH between sequential relationship.Sequential relationship is illustrated exemplified by configuring 1 shown in Fig. 3.
As seen from the above technical solution, the key point of the application is：
1st, system does not configure PUCCH resource, so as to which without using PUCCH, the RB resources vacateed be used to PUSCH.It vacates
RB resources it is bigger, upstream rate promoted effect it is more apparent.
2nd, terminal needs to send the control information of uplink L1/L2 in present sub-frame, is transmitted completely by PUSCH.
The 3rd, if terminal is not previously allocated to send the ascending resource of UL-SCH data, base station construction in present sub-frame
Pre- uplink scheduling authorization (UL Grant) meets.
The foregoing is merely the preferred embodiment of the application, not limiting the application, all essences in the application
God and any modification, equivalent substitution, improvement and etc. within principle, done, should be included within the scope of the application protection.
Claims (3)
- A kind of 1. method for promoting Long Term Evolution LTE system upstream rate, which is characterized in that including：Judge whether terminal has been allocated for sending the ascending resource of Uplink Shared Channel UL-SCH data in present sub-frame；If terminal is not previously allocated to send the ascending resource of UL-SCH data in present sub-frame, base station construction uplink is pre- The pre- UL Grant of scheduling authorization are sent to the terminal, also, do not configure Physical Uplink Control Channel PUCCH moneys for the terminal Source uses corresponding resource block RB resources to Physical Uplink Shared Channel PUSCH.
- 2. according to the method described in claim 1, it is characterized in that：Terminal sends data and uplink L1/L2 control information on the PUSCH.
- 3. according to the method described in claim 1, it is characterized in that：Terminal is invalid padding with the PUSCH upstream datas sent according to the pre- UL Grant, the correspondence that base station receives Data be invalid padding.
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| CN201611042257.9A CN108093479A (en) | 2016-11-23 | 2016-11-23 | A kind of method for promoting LTE system upstream rate |
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| CN201611042257.9A CN108093479A (en) | 2016-11-23 | 2016-11-23 | A kind of method for promoting LTE system upstream rate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113826342A (en) * | 2019-08-13 | 2021-12-21 | 华为技术有限公司 | Communication method and related equipment |
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