CN110798809B - Time delay estimation method and device - Google Patents
Time delay estimation method and device Download PDFInfo
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- CN110798809B CN110798809B CN201810874356.6A CN201810874356A CN110798809B CN 110798809 B CN110798809 B CN 110798809B CN 201810874356 A CN201810874356 A CN 201810874356A CN 110798809 B CN110798809 B CN 110798809B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
Abstract
The application discloses a multicast time delay estimation method and a device, wherein the method comprises the following steps: when synchronous detection is carried out, User Equipment (UE) determines the current eMBMS effective signal window range according to a preset synchronous position selection strategy; and the UE calculates the time delay difference of the synchronization signal of each adjacent cell in the eMBMS effective signal window range relative to the corresponding synchronization signal of the service cell, and estimates the time delay position of the multicast signal received by the UE according to the time delay difference, wherein the synchronization signal is a main synchronization signal and/or an auxiliary synchronization signal. The method and the device are favorable for accurately estimating the eMBMS synchronous position.
Description
Technical Field
The present invention relates to mobile communication technology, and in particular, to a method and an apparatus for estimating a terminal delay of a Multicast/Multicast over Single Frequency Network (MBSFN) system.
Background
The development of mobile video services has brought unprecedented pressure and challenges to cellular networks. Compared with other wireless access technologies, the bandwidth supported by LTE is larger, the time delay is shorter, meanwhile, the multicast service adopts a dedicated channel, the service channel is not occupied, the network resource is greatly saved, and the application prospect is wide. A multicast/multicast single frequency network requires the simultaneous transmission of identical waveforms from multiple cells. So that the UE receiver can treat multiple MBSFN cells as one large cell. As shown in fig. 1, an evolved multimedia broadcast multicast service (eMBMS) signal is a set of air interface radio signals sent by multiple neighboring cells in the same time-frequency resource. In this way, the UE will not only not suffer from inter-cell interference of neighboring cell transmissions, but will also benefit from superposition of signals from multiple MBSFN cells.
Therefore, for the multicast signal, the signal envelope delay characteristic is different from that of the ordinary cellular signal, and the delay spread is larger, as shown in table 1.
Propagation Conditions for Multi-Path Fading Environments for MBSFN Performance Requirements in an extended delay spread environment
TABLE 1
Due to the small coverage of the conventional cyclic prefix (NCP), the protocol specifically chooses to extend the cyclic prefix (ECP) from 144Ts to 512Ts, while also extending the effective distance from 1.4KM to 5.0 KM; thereby improving the reception performance of the terminal.
Therefore, the terminal needs to design multicast timing separately to achieve normal MBSFN reception in a large delay scenario, and the existing schemes all adopt a timing adjustment loop as shown in fig. 2.
In existing timing adjustment schemes, synchronization detection is typically based on Multicast Reference Signals (MRSs). However, due to variable wireless signal fading, the delay parameter of the multicast signal estimated based on the MRS detection may not match with the parameter at the subsequent demodulation time, which may cause signal windowing (including a signal windowing leading edge, a signal windowing trailing edge, and a delay spread length smaller than an actual signal window length) in the eMBMS signal demodulation process, and the windowing may cause degradation of subsequent filtering performance and demodulation capability.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a method and an apparatus for estimating a delay, which are beneficial to accurately estimating an eMBMS synchronization position.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a multicast delay estimation method, comprising:
when synchronous detection is carried out, User Equipment (UE) determines the current eMBMS effective signal window range according to a preset synchronous position selection strategy;
and the UE calculates the time delay difference of the synchronization signal of each adjacent cell in the eMBMS effective signal window range relative to the corresponding synchronization signal of the service cell, and estimates the time delay position of the multicast signal received by the UE according to the time delay difference, wherein the synchronization signal is a main synchronization signal and/or an auxiliary synchronization signal.
Preferably, the synchronization position selection policy includes:
if the absolute level of the designated signal of the adjacent cell corresponding to the detected frequency point is less than the preset thermal noise level, the adjacent cell corresponding to the detected frequency point does not belong to the effective signal window range of the eMBMS; the designated signal is a primary synchronization signal PSS, a secondary synchronization signal SSS or a cell reference signal CRS.
Preferably, the synchronization position selection policy includes:
and if the relative difference value of the RSRP of the adjacent cell corresponding to the detected frequency point and the service cell of the UE is greater than the preset RSRP difference value threshold, the adjacent cell corresponding to the detected frequency point does not belong to the eMBMS effective signal window range.
Preferably, the synchronization position selection policy includes:
and if the relative difference value of the multicast reference signal MRS of the adjacent cell corresponding to the detected frequency point is larger than a preset MRS difference value threshold and/or the absolute level is smaller than a preset MRS absolute level threshold, the adjacent cell corresponding to the detected frequency point does not belong to the eMBMS effective signal window range.
Preferably, the window length of the synchronous detection is smaller than or equal to 512 Ts.
A multicast latency estimation apparatus, comprising:
the effective signal window determining unit is used for determining the current eMBMS effective signal window range according to a preset synchronous position selection strategy when synchronous detection is carried out;
and the time delay estimation unit is used for calculating the time delay difference of the synchronization signal of each adjacent cell in the eMBMS effective signal window range relative to the corresponding synchronization signal of the service cell, and estimating the time delay position of the multicast signal received by the UE according to the time delay difference, wherein the synchronization signal is a main synchronization signal and/or an auxiliary synchronization signal.
Preferably, the synchronization position selection policy includes:
if the absolute level of the designated signal of the adjacent cell corresponding to the detected frequency point is less than the preset thermal noise level, the adjacent cell corresponding to the detected frequency point does not belong to the effective signal window range of the eMBMS; the designated signal is a primary synchronization signal PSS, a secondary synchronization signal SSS or a cell reference signal CRS.
Preferably, the synchronization position selection policy includes:
and if the relative difference value of the RSRP of the adjacent cell corresponding to the detected frequency point and the service cell of the UE is greater than the preset RSRP difference value threshold, the adjacent cell corresponding to the detected frequency point does not belong to the eMBMS effective signal window range.
Preferably, the synchronization position selection policy includes:
and if the relative difference value of the multicast reference signal MRS of the adjacent cell corresponding to the detected frequency point is larger than a preset MRS difference value threshold and/or the absolute level is smaller than a preset MRS absolute level threshold, the adjacent cell corresponding to the detected frequency point does not belong to the eMBMS effective signal window range.
Preferably, the window length of the synchronous detection is smaller than or equal to 512 Ts.
In summary, the multicast delay estimation method and apparatus provided by the present invention are based on that the multicast signal of each cell and the synchronization signal of the cell are relatively fixed in position, and the synchronization signal occupies a fixed time-frequency position, so that the detection is easy and the detection performance is good, and the delay position of the multicast signal is accurately estimated by using the delay difference between the synchronization signal of the neighboring multi-cell and the synchronization signal of the cell. Therefore, the accuracy of the multicast signal time delay position estimation can be improved, and the eMBMS synchronous position can be estimated more accurately.
Drawings
FIG. 1 is a schematic diagram of signal superposition of multiple MBSFN cells;
FIG. 2 is a schematic diagram of a prior art timing adjustment scheme;
FIG. 3 is a schematic flow chart of a method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus 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.
The core idea of the invention is as follows: considering that the positions of the multicast signal of each cell and the synchronization signal (including the PSS signal and the SSS signal) of the cell are relatively fixed, the synchronization signal occupies a fixed time-frequency position, and is easy to detect and has better detection performance, the present invention estimates the time delay position of the multicast signal of the neighbor multi-cell synchronization signal by using the time delay difference of the synchronization signal of the neighbor multi-cell synchronization signal relative to the synchronization signal of the cell, so as to estimate the eMBMS synchronization position more accurately.
Fig. 3 is a schematic flowchart of a method according to an embodiment of the present invention, and as shown in fig. 3, the method for estimating multicast delay implemented in the embodiment mainly includes:
Preferably, in order to ensure the accuracy of the valid signal window range determined in this step, so as to accurately estimate the synchronization position of the eMBMS, the synchronization position selection policy may include any one or more of the following rules:
rule one, if the absolute level of the designated signal of the adjacent cell corresponding to the detected frequency point is less than the preset thermal noise level, the adjacent cell corresponding to the detected frequency point does not belong to the eMBMS effective signal window range; the designated signal is a primary synchronization signal PSS, a secondary synchronization signal SSS or a cell reference signal CRS.
And a second rule, if the relative difference value of the RSRP of the adjacent cell corresponding to the detected frequency point and the service cell of the UE is greater than a preset RSRP difference value threshold, the adjacent cell corresponding to the detected frequency point does not belong to the eMBMS effective signal window range.
And a third rule, if the relative difference value of the multicast reference signal MRS of the adjacent cell corresponding to the detected frequency point is greater than a preset MRS difference value threshold and/or the absolute level is less than a preset MRS absolute level threshold, the adjacent cell corresponding to the detected frequency point does not belong to the eMBMS effective signal window range.
By utilizing the synchronous position selection strategy, all signal energy can be maximally brought into a signal window, so that the optimal demodulation signal-to-noise ratio can be achieved.
In practical applications, in order to ensure that the valid signal does not go out of the window in accordance with the existing protocol, it is preferable that the window length of the synchronous detection is less than or equal to 512Ts during the synchronous detection, and the total window length is not more than 512Ts regardless of the advance or the delay.
In this step, the specific calculation method for the delay difference and the estimation of the delay position of the multicast signal received by the UE according to the delay difference is known to those skilled in the art, and is not described herein again.
In the above embodiment, the positions of the multicast signal and the synchronization signal based on the cell are relatively fixed, and the synchronization signal occupies a fixed time-frequency position, so that the method has the advantages of easy detection and good detection performance, and the time delay position of the multicast signal is accurately estimated by using the time delay difference of the synchronization signal of the neighboring multi-cell relative to the synchronization signal of the cell. Therefore, the accuracy of the multicast signal time delay position estimation can be improved, and the eMBMS synchronous position can be estimated more accurately.
Fig. 4 is a schematic structural diagram of a multicast delay estimation apparatus corresponding to the foregoing method, as shown in fig. 4, the apparatus includes:
the effective signal window determining unit is used for determining the current eMBMS effective signal window range according to a preset synchronous position selection strategy when synchronous detection is carried out;
and the time delay estimation unit is used for calculating the time delay difference of the synchronization signal of each adjacent cell in the eMBMS effective signal window range relative to the corresponding synchronization signal of the service cell, and estimating the time delay position of the multicast signal received by the UE according to the time delay difference, wherein the synchronization signal is a main synchronization signal and/or an auxiliary synchronization signal.
Preferably, the synchronization position selection policy includes:
if the absolute level of the designated signal of the adjacent cell corresponding to the detected frequency point is less than the preset thermal noise level, the adjacent cell corresponding to the detected frequency point does not belong to the effective signal window range of the eMBMS; the designated signal is a primary synchronization signal PSS, a secondary synchronization signal SSS or a cell reference signal CRS.
Preferably, the synchronization position selection policy includes:
and if the relative difference value of the RSRP of the adjacent cell corresponding to the detected frequency point and the service cell of the UE is greater than the preset RSRP difference value threshold, the adjacent cell corresponding to the detected frequency point does not belong to the eMBMS effective signal window range.
Preferably, the synchronization position selection policy includes:
and if the relative difference value of the multicast reference signal MRS of the adjacent cell corresponding to the detected frequency point is larger than a preset MRS difference value threshold and/or the absolute level is smaller than a preset MRS absolute level threshold, the adjacent cell corresponding to the detected frequency point does not belong to the eMBMS effective signal window range.
Preferably, the window length of the synchronous detection is smaller than or equal to 512 Ts.
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 (4)
1. A method for multicast delay estimation, comprising:
when synchronous detection is carried out, User Equipment (UE) determines the current eMBMS effective signal window range according to a preset synchronous position selection strategy;
the UE calculates the time delay difference of the synchronous signal of each adjacent cell in the eMBMS effective signal window range relative to the corresponding synchronous signal of the service cell, and estimates the time delay position of the multicast signal received by the UE according to the time delay difference, wherein the synchronous signal is a main synchronous signal and/or an auxiliary synchronous signal;
wherein the synchronization position selection policy comprises:
if the absolute level of the designated signal of the adjacent cell corresponding to the detected frequency point is less than the preset thermal noise level, the adjacent cell corresponding to the detected frequency point does not belong to the effective signal window range of the eMBMS; the designated signal is a primary synchronization signal PSS, a secondary synchronization signal SSS or a cell reference signal CRS;
and/or the presence of a gas in the gas,
if the relative difference value of the RSRP of the adjacent cell corresponding to the detected frequency point and the service cell of the UE is larger than the preset RSRP difference value threshold, the adjacent cell corresponding to the detected frequency point does not belong to the eMBMS effective signal window range;
and/or the presence of a gas in the gas,
and if the relative difference value of the multicast reference signal MRS of the adjacent cell corresponding to the detected frequency point is larger than a preset MRS difference value threshold and/or the absolute level is smaller than a preset MRS absolute level threshold, the adjacent cell corresponding to the detected frequency point does not belong to the eMBMS effective signal window range.
2. The method of claim 1, wherein the window length for synchronous detection is 512Ts or less.
3. A multicast delay estimation apparatus, comprising:
the effective signal window determining unit is used for determining the current eMBMS effective signal window range according to a preset synchronous position selection strategy when synchronous detection is carried out;
the time delay estimation unit is used for calculating the time delay difference of the synchronization signal of each adjacent cell in the eMBMS effective signal window range relative to the corresponding synchronization signal of the service cell, and estimating the time delay position of the multicast signal received by the UE according to the time delay difference, wherein the synchronization signal is a main synchronization signal and/or an auxiliary synchronization signal;
wherein the synchronization position selection policy comprises:
if the absolute level of the designated signal of the adjacent cell corresponding to the detected frequency point is less than the preset thermal noise level, the adjacent cell corresponding to the detected frequency point does not belong to the effective signal window range of the eMBMS; the designated signal is a primary synchronization signal PSS, a secondary synchronization signal SSS or a cell reference signal CRS;
and/or the presence of a gas in the gas,
if the relative difference value of the RSRP of the adjacent cell corresponding to the detected frequency point and the service cell of the UE is larger than the preset RSRP difference value threshold, the adjacent cell corresponding to the detected frequency point does not belong to the eMBMS effective signal window range;
and/or the presence of a gas in the gas,
and if the relative difference value of the multicast reference signal MRS of the adjacent cell corresponding to the detected frequency point is larger than a preset MRS difference value threshold and/or the absolute level is smaller than a preset MRS absolute level threshold, the adjacent cell corresponding to the detected frequency point does not belong to the eMBMS effective signal window range.
4. The apparatus of claim 3, wherein the window length for synchronous detection is 512Ts or less.
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| CN101583081A (en) * | 2008-05-15 | 2009-11-18 | 大唐移动通信设备有限公司 | Method, system and device for establishing synchronous bearing |
| CN102111208A (en) * | 2009-12-25 | 2011-06-29 | 中兴通讯股份有限公司 | System and method for receiving system information for first class relay station |
| KR20170028151A (en) * | 2015-09-03 | 2017-03-13 | 주식회사 케이티 | Method, apparatus and computer program stored in computer readable medium for synchronizing terminals in multimedia broadcast multicast service |
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| US9084223B2 (en) * | 2010-09-30 | 2015-07-14 | Samsung Electronics Co., Ltd. | Method and apparatus for providing multi-media broadcast multicast services data to user equipment over relay nodes |
| US9226266B2 (en) * | 2013-09-03 | 2015-12-29 | Telefonaktiebolaget L M Ericsson (Publ) | Method for determining delay parameters for user data flow synchronization for eMBMS |
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| CN101583081A (en) * | 2008-05-15 | 2009-11-18 | 大唐移动通信设备有限公司 | Method, system and device for establishing synchronous bearing |
| CN102111208A (en) * | 2009-12-25 | 2011-06-29 | 中兴通讯股份有限公司 | System and method for receiving system information for first class relay station |
| KR20170028151A (en) * | 2015-09-03 | 2017-03-13 | 주식회사 케이티 | Method, apparatus and computer program stored in computer readable medium for synchronizing terminals in multimedia broadcast multicast service |
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