CN112087796A - Single subband system downlink transmission control method and system - Google Patents
Single subband system downlink transmission control method and system Download PDFInfo
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- CN112087796A CN112087796A CN201910505364.8A CN201910505364A CN112087796A CN 112087796 A CN112087796 A CN 112087796A CN 201910505364 A CN201910505364 A CN 201910505364A CN 112087796 A CN112087796 A CN 112087796A
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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
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- 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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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Abstract
The application discloses a single subband system downlink transmission control method and a system, wherein the method comprises the following steps: for UE occupying downlink resources currently, a base station performs on-off control on a protection interval mode of the UE according to a sending frame number of current downlink transmission and a preset threshold value of the sending frame number of the downlink transmission, and notifies the UE; skipping the guard interval for downlink transmission at each preset guard interval when the guard interval mode of the UE is in an open state; the guard interval is set according to a preset guard interval period, and the guard interval in each guard interval period is at least partially overlapped with a preset paging period. The invention can not only meet the requirement of enhancing the coverage of the terminal, but also effectively reduce the influence on the uplink and downlink authorization and the downlink service channel transmission of other terminals.
Description
Technical Field
The present invention relates to communications technologies, and in particular, to a method and a system for controlling downlink transmission of a single subband system.
Background
For a single-subband wireless private network communication system, the bandwidth of a subband is 25kHz, the interval of subcarriers is 2kHz, and the number of subcarriers in the subband is 11. The radio frame period of the system is 25ms, the radio frame period is divided into 5 subframes, and the subframes are numbered as 0-4 in sequence. Wherein, the subframe 0 is a downlink subframe, the subframe 1 is a special subframe, and the others are uplink subframes. Taking the subframe i as an example, the frame structure of the wireless private network is shown in fig. 1.
In the wireless private network system, a user searches paging information in a resident subband period, and if the paging information is searched and the current subband is idle, service processing is carried out on the subband. In order to enhance the coverage level, a downlink control channel (PDCCH) and a downlink shared channel (PDSCH) which carry downlink control information and downlink traffic transmit data in a time domain repetition manner.
The PDCCH has a period T ═ PDCCH-NumRepetitions × PDCCH-StartF, where PDCCH-NumRepetitions is the maximum number of repetitions of the PDCCH, and takes a value of {1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048} in units of frames, and PDCCH-StartF is the number of frames occupied by each PDCCH transmission and takes a value of {2, 4, 8, 16, 32, 48, 64 }.
According to the Downlink Control Information (DCI) indication of a downlink control channel, the terminal obtains the number N of wireless frames allocated to the PDSCHFAnd the number of repetitions NrepThe resource allocation is performed in the order of frequency domain first and time domain second. The number of transmission frames of PDSCH is N ═ NrepNF. Wherein N isF＝{1...8}，Nrep＝{1，2，4，8，16，32，64，128，192，256，384，512，768，1024，1536，2048}。
To achieve the maximum 20dB coverage improvement requirement for single subband systems, the PDCCH and PDSCH for one UE need to be retransmitted for thousands of milliseconds. In carrying out the present invention, applicants have discovered that: if the terminal of the single sub-band communication system needs to enhance coverage, uplink and downlink authorization and downlink service channel transmission of other UE (user equipment) can be blocked, and uplink resources are wasted. The specific analysis is as follows:
if the downlink resource is continuously occupied by one UE in the coverage enhancement scenario, at this time, the downlink service transmission of other terminals, especially the UE that does not need coverage enhancement, is blocked, and the uplink grant of other UEs is also blocked, which results in the waste of the uplink resource. If the terminal traffic is not large, the basic performance can be ensured, and the requirements of coverage and time delay are met. However, when the channel quality of the terminal is not good, the repetition time increases, which causes a larger delay and affects the throughput of the system. Fig. 2 shows a schematic diagram of PDCCH and PDSCH scheduling with enhanced coverage, and it can be seen from fig. 2 that: since DL is occupied by one UE for a long time, UL scheduling of other terminals cannot be performed, resulting in long-time UL vacancy. This also results in no DL scheduling for other terminals.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a method and a system for controlling downlink transmission of a single subband system, which can not only meet the requirement of enhanced coverage of a terminal, but also effectively reduce the influence of the enhanced coverage on uplink and downlink authorization and downlink traffic channel transmission of other terminals.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a downlink transmission control method for a single subband system comprises the following steps:
for UE occupying downlink resources currently, a base station performs on-off control on a protection interval mode of the UE according to a sending frame number of current downlink transmission and a preset threshold value of the sending frame number of the downlink transmission, and notifies the UE;
skipping each preset guard interval to perform downlink transmission when the guard interval mode of the UE is in an open state; the guard interval is set according to a preset guard interval period, and the guard interval in each guard interval period is at least partially overlapped with a preset paging period.
Preferably, the switching control of the guard interval mode includes:
if the sending frame number of the current downlink transmission is larger than the threshold value of the sending frame number of the downlink transmission and the protection interval mode of the UE is in a closed state, the protection interval mode of the UE is started;
and if the sending frame number of the current downlink transmission is not greater than the threshold value of the downlink transmission sending frame number and the protection interval mode of the UE is in an open state, closing the protection interval mode of the UE.
Preferably, the guard interval in each guard interval period completely covers the paging period in the guard interval period.
Preferably, the guard interval in each guard interval period and the paging period in the guard interval period have the same starting position.
Preferably, the guard interval period is an integer multiple of the paging period.
A downlink transmission control system for a single subband system, comprising:
the base station carries out on-off control on the protection interval mode of the UE according to the sending frame number of the current downlink transmission and a preset threshold value of the sending frame number of the downlink transmission for the UE occupying the downlink resource currently, and informs the UE;
the UE skips each preset guard interval to carry out downlink transmission when the guard interval mode of the UE is in an open state; the guard interval is set according to a preset guard interval period, and the guard interval in each guard interval period is at least partially overlapped with a preset paging period.
Preferably, the switching control of the guard interval mode by the base station includes:
if the sending frame number of the current downlink transmission is larger than the threshold value of the sending frame number of the downlink transmission and the protection interval mode of the UE is in a closed state, the protection interval mode of the UE is started;
and if the sending frame number of the current downlink transmission is not greater than the threshold value of the downlink transmission sending frame number and the protection interval mode of the UE is in an open state, closing the protection interval mode of the UE.
Preferably, the guard interval in each guard interval period completely covers the paging period in the guard interval period.
Preferably, the guard interval in each guard interval period and the paging period in the guard interval period have the same starting position.
Preferably, the guard interval period is an integer multiple of the paging period.
In summary, according to the control method and system for downlink transmission of a single subband system provided by the present invention, by presetting periodically distributed guard intervals and monitoring downlink transmission amount in real time, when the downlink transmission amount is large, a downlink guard interval mode is started, and when the downlink guard interval mode is started, a UE currently occupying downlink transmission resources cannot perform downlink transmission in the downlink guard interval, and other accessed UEs in a cell except the UE can perform PDCCH search for scheduling authorization in a paging cycle time period covered by the guard interval, so that not only can the requirement of enhanced coverage of a terminal be met, but also the influence of the enhanced coverage on uplink and downlink authorization and downlink traffic channel transmission of other terminals can be effectively reduced.
Drawings
Fig. 1 is a frame structure diagram of a conventional wireless private network, taking a subframe i as an example;
fig. 2 is a diagram of a coverage enhanced PDCCH and PDSCH scheduling;
FIG. 3 is a schematic flow chart of a method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a guard interval configuration according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 3 is a schematic flow chart of a method according to an embodiment of the present invention, and as shown in fig. 3, the method for controlling downlink transmission of a single subband system implemented in the embodiment mainly includes:
In this step, different from the existing random access scheme, the base station needs to perform on-off control on the guard interval mode of the UE currently occupying the downlink resource according to the current downlink transmission sending frame number and a preset downlink transmission sending frame number threshold, so that when the downlink resource occupied by the UE is large, the UE is controlled not to occupy the downlink resource in a certain downlink frame by starting the guard interval mode, and thus, the influence of enhanced coverage on the uplink and downlink authorization and downlink traffic channel transmission of other terminals can be reduced.
Preferably, the base station may perform on-off control on the guard interval mode by using a policy of turning on the downlink guard interval mode when the downlink transmission amount of the current UE is large, and specifically may perform on-off control on the guard interval mode by using the following method:
if the sending frame number of the current downlink transmission is larger than the threshold value of the sending frame number of the downlink transmission and the protection interval mode of the UE is in a closed state, the protection interval mode of the UE is started;
and if the sending frame number of the current downlink transmission is not greater than the threshold value of the downlink transmission sending frame number and the protection interval mode of the UE is in an open state, closing the protection interval mode of the UE.
In the above switch control method, when the sending frame number of the current downlink transmission is greater than the threshold value of the sending frame number of the downlink transmission, it indicates that the amount of data transmitted by the UE currently occupying the downlink resource is large, and at this time, the uplink and downlink authorization and the downlink traffic channel transmission of other terminals are seriously affected, so that the guard interval mode of the UE currently occupying the downlink resource needs to be started to reduce the effect of the guard interval mode on other UEs.
And when the sending frame number of the current downlink transmission is not greater than the threshold value of the sending frame number of the downlink transmission, it indicates that the data volume transmitted by the UE currently occupying the downlink resource is not large, and at this time, the uplink and downlink authorization and the downlink service channel transmission of other terminals are not seriously affected, so that the protection interval mode of the UE currently occupying the downlink resource needs to be closed, so as to better meet the requirement of the enhanced coverage of the terminal.
In practical application, the threshold of the downlink transmission frame number may be set to a suitable value by a person skilled in the art according to actual needs, as long as the influence degree of the data amount transmitted by the UE currently occupying the downlink resource on other UEs in the cell can be better reflected, so as to timely start the guard interval mode of the UE and obtain the effect of reducing the influence of the enhanced coverage on other UEs.
It should be noted that, when the guard interval mode of the UE is turned off, the UE currently occupying the downlink resource is not subjected to downlink control, that is, the UE is normally transmitted in the existing coverage enhancement mode.
Here, when the guard interval mode of the UE is in the on state, the UE needs to skip each preset guard interval to perform downlink transmission, that is, the UE considers that the guard interval in the guard interval period is an invalid frame and cannot perform downlink transmission, so that the UE abandons occupation of the guard interval, and thus other UEs may perform uplink and downlink authorization and downlink traffic channel transmission by using a time period overlapping with a paging period in the guard interval, that is, other UEs may perform PDCCH search for scheduling authorization in the paging period time period covered by the guard interval.
In this step, by at least partially overlapping the guard interval in each guard interval period with the preset paging period, it can be ensured that when the guard interval mode of the UE is in the on state, other UEs can perform uplink and downlink authorization and downlink traffic channel transmission by using the time period overlapping the paging period in the guard interval, so as to reduce the influence of the enhanced coverage on other accessed UEs.
In practical applications, those skilled in the art can set the length of the guard interval period and the relationship between the guard interval and the paging period in each interval period according to actual needs.
Preferably, in order to minimize the impact of enhanced coverage on other accessed UEs, the guard interval in each guard interval period may completely cover the paging period in the guard interval period.
Preferably, the guard interval in each guard interval period and the paging period in the guard interval period have the same starting position.
Further, in order to fully utilize the guard interval resources in each guard interval period, the guard interval in each guard interval period may completely overlap with the paging period in the guard interval period.
Preferably, the guard interval period may be an integer multiple of the paging period.
For example, the configuration shown in fig. 4 may be adopted, where the guard interval period is 4 times of the paging cycle, and the length of the guard interval is the length of one paging cycle.
Corresponding to the foregoing method, an embodiment of the present invention further provides a downlink transmission control system for a single subband system, including:
the base station carries out on-off control on the protection interval mode of the UE according to the sending frame number of the current downlink transmission and a preset threshold value of the sending frame number of the downlink transmission for the UE occupying the downlink resource currently, and informs the UE;
the UE skips each preset guard interval to carry out downlink transmission when the guard interval mode of the UE is in an open state; the guard interval is set according to a preset guard interval period, and the guard interval in each guard interval period is at least partially overlapped with a preset paging period.
Preferably, the switching control of the guard interval mode by the base station includes:
if the sending frame number of the current downlink transmission is larger than the threshold value of the sending frame number of the downlink transmission and the protection interval mode of the UE is in a closed state, the protection interval mode of the UE is started;
and if the sending frame number of the current downlink transmission is not greater than the threshold value of the downlink transmission sending frame number and the protection interval mode of the UE is in an open state, closing the protection interval mode of the UE.
Preferably, the guard interval in each guard interval period completely covers the paging period in the guard interval period.
Preferably, the guard interval in each guard interval period and the paging period in the guard interval period have the same starting position.
Preferably, the guard interval period is an integer multiple of the paging period.
It can be seen from the foregoing embodiments that, in the downlink transmission control method and system for a single subband system according to the embodiments of the present invention, by presetting periodically distributed guard intervals and monitoring the downlink transmission amount in real time, when the downlink transmission amount is large, the downlink guard interval mode is started, and when the downlink guard interval mode is started, the UE currently occupying downlink transmission resources cannot perform downlink transmission in the downlink guard interval, so that other UEs in a cell can perform normal downlink paging space search and/or PDCCH search for scheduling grant in the downlink guard interval, thereby not only satisfying the requirement of enhanced coverage of a terminal, but also effectively reducing the influence of the enhanced coverage on uplink and downlink grant and downlink traffic channel transmission of other terminals.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A downlink transmission control method of a single subband system is characterized by comprising the following steps:
for UE occupying downlink resources currently, a base station performs on-off control on a protection interval mode of the UE according to a sending frame number of current downlink transmission and a preset threshold value of the sending frame number of the downlink transmission, and notifies the UE;
skipping each preset guard interval to perform downlink transmission when the guard interval mode of the UE is in an open state; the guard interval is set according to a preset guard interval period, and the guard interval in each guard interval period is at least partially overlapped with a preset paging period.
2. The method of claim 1, wherein the switching the guard interval mode comprises:
if the sending frame number of the current downlink transmission is larger than the threshold value of the sending frame number of the downlink transmission and the protection interval mode of the UE is in a closed state, the protection interval mode of the UE is started;
and if the sending frame number of the current downlink transmission is not greater than the threshold value of the downlink transmission sending frame number and the protection interval mode of the UE is in an open state, closing the protection interval mode of the UE.
3. The method of claim 1, wherein a guard interval in each guard interval period completely covers a paging period in the guard interval period.
4. The method of claim 1 or 3, wherein the guard interval in each guard interval period and the paging period in the guard interval period have the same starting position.
5. The method of claim 1, wherein the guard interval period is an integer multiple of the paging period.
6. A downlink transmission control system for a single subband system, comprising:
the base station carries out on-off control on the protection interval mode of the UE according to the sending frame number of the current downlink transmission and a preset threshold value of the sending frame number of the downlink transmission for the UE occupying the downlink resource currently, and informs the UE;
the UE skips each preset guard interval to carry out downlink transmission when the guard interval mode of the UE is in an open state; the guard interval is set according to a preset guard interval period, and the guard interval in each guard interval period is at least partially overlapped with a preset paging period.
7. The system of claim 6, wherein the base station performs switching control on the guard interval mode, comprising:
if the sending frame number of the current downlink transmission is larger than the threshold value of the sending frame number of the downlink transmission and the protection interval mode of the UE is in a closed state, the protection interval mode of the UE is started;
and if the sending frame number of the current downlink transmission is not greater than the threshold value of the downlink transmission sending frame number and the protection interval mode of the UE is in an open state, closing the protection interval mode of the UE.
8. The system of claim 6, wherein the guard interval in each guard interval period completely covers the paging period in the guard interval period.
9. The system according to claim 6 or 8, wherein the guard interval in each guard interval period and the paging period in the guard interval period have the same starting position.
10. The system of claim 6, wherein the guard interval period is an integer multiple of the paging period.
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| CN109716840A (en) * | 2016-09-28 | 2019-05-03 | 华为技术有限公司 | Data transmission method, base station and user equipment |
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| US20140038607A1 (en) * | 2012-08-06 | 2014-02-06 | Apple Inc. | Performing Neighboring Cell Searches While Transitioning to Connected-Mode |
| CN106162656A (en) * | 2015-03-30 | 2016-11-23 | 中国电信股份有限公司 | Method, base station, terminal and the communication system of data transmission |
| CN106603207A (en) * | 2015-10-14 | 2017-04-26 | 中国移动通信集团公司 | Signal transmission method and device |
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