CN113543039B - Multicast signal sending method and device - Google Patents
Multicast signal sending method and device Download PDFInfo
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- CN113543039B CN113543039B CN202010322832.0A CN202010322832A CN113543039B CN 113543039 B CN113543039 B CN 113543039B CN 202010322832 A CN202010322832 A CN 202010322832A CN 113543039 B CN113543039 B CN 113543039B
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- 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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- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/364—Delay profiles
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention provides a multicast signal sending method and equipment, which are applied to a first base station, and the method comprises the following steps: acquiring first time delay information of a first cell and second time delay information of a neighboring cell of the first cell, wherein the first cell is a cell where the first base station is located; judging whether to adjust the sending time delay information of the first base station or not according to the first time delay information and the second time delay information; if the sending delay information of the first base station is adjusted, obtaining increasing delay information, and adjusting the sending delay information according to the increasing delay information to obtain target sending delay information; and sending the multicast signal to a first terminal according to the target sending delay information, wherein the current service cell of the first terminal is the first cell, so that the first terminal can demodulate the multicast signal sent by the first base station and the base stations in the adjacent cell at the same time to obtain corresponding video content, and the demodulation capability of the terminal on the multicast signal is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a method and equipment for sending a multicast signal.
Background
Multicast/Multicast Single Frequency Network (MBSFN), which requires the simultaneous transmission of identical waveforms from multiple cells. The terminal located in one of the cells can receive the multicast signal sent by the base station of the cell and the multicast signals sent by the base stations of other adjacent cells, and then demodulate the multicast signal sent by the base station of the cell and the multicast signal sent by the base station of the adjacent cells to obtain corresponding video content.
Conventionally, when demodulating a multicast Signal transmitted by a base station of a local cell and a multicast Signal transmitted by a base station of a neighboring cell, a terminal calculates a Signal to Interference plus Noise Ratio (SINR) from the multicast signals in a Signal window.
However, the inventors found that at least the following problems exist in the prior art: because the length of the signal window is limited, only signals with time delay within a certain range can be demodulated, when the time delay of the multicast signal received by the terminal and sent by the neighboring base station is large, the multicast signal can be used as an interference signal when the signal to interference plus noise ratio is calculated, the multicast signal cannot be demodulated, the obtained signal to interference plus noise ratio is small, and the demodulation capability of the terminal on the multicast signal is reduced.
Disclosure of Invention
The embodiment of the invention provides a method and equipment for sending a multicast signal, which are used for improving the demodulation capacity of a terminal on the multicast signal.
In a first aspect, an embodiment of the present invention provides a method for sending a multicast signal, where the method is applied to a first base station, and the method includes:
acquiring first time delay information of a first cell and second time delay information of a neighboring cell of the first cell, wherein the first cell is a cell where the first base station is located;
judging whether to adjust the sending time delay information of the first base station or not according to the first time delay information and the second time delay information;
if the sending delay information of the first base station is adjusted, obtaining increasing delay information, and adjusting the sending delay information according to the increasing delay information to obtain target sending delay information;
and sending the multicast signal to a first terminal according to the target sending delay information, wherein the current service cell of the first terminal is the first cell.
In one possible design, before the obtaining the first delay information of the first cell and the second delay information of the neighboring cell of the first cell, the method includes:
acquiring first transmission delay information sent by a first terminal, wherein the first transmission delay information comprises delay information of each cell where the first terminal is located;
and determining the first time delay information and the second time delay information according to the first sending time delay information.
In a possible design, the determining whether to adjust the transmission delay information of the first base station according to the first delay information and the second delay information includes:
acquiring a difference value between the first time delay information and the second time delay information;
if the difference value between the first time delay information and the second time delay information is larger than a preset difference value, determining to adjust the sending time delay information of the first base station;
and if the difference value between the first time delay information and the second time delay information is smaller than or equal to the preset difference value, determining not to adjust the sending time delay information of the first base station.
In one possible design, the determining the first delay information and the second delay information according to the first transmission delay information includes:
selecting second sending delay information from the first sending delay information, wherein the second sending delay information is the first sending delay information sent by a first terminal in an overlapping area, and the overlapping area is an area where the first cell and the adjacent cell are intersected;
acquiring the time delay information of a first cell from the second sending time delay information, and acquiring the first time delay information according to the time delay information of the first cell;
and acquiring the time delay information of the adjacent region from the second sending time delay information, and acquiring the second time delay information according to the time delay information of the adjacent region.
In one possible design, the transmission delay information includes an initial transmission delay, the increased delay information includes an increased delay, and the target transmission delay information includes a target transmission delay;
the adjusting the sending delay information according to the increasing delay information to obtain target sending delay information comprises:
and acquiring the sum of the emission time delay and the increased time delay to obtain the target emission time delay.
In a second aspect, an embodiment of the present invention provides a multicast signal sending apparatus, which is applied to a first base station, and includes:
a delay information obtaining module, configured to obtain first delay information of a first cell and second delay information of a neighboring cell of the first cell, where the first cell is a cell where the first base station is located;
an adjustment determining module, configured to determine whether to adjust the transmission delay information of the first base station according to the first delay information and the second delay information;
a delay adjusting module, configured to obtain increased delay information if the transmission delay information of the first base station is adjusted, and adjust the transmission delay information according to the increased delay information to obtain target transmission delay information;
and a signal sending module, configured to send the multicast signal to a first terminal according to the target sending delay information, where a current serving cell of the first terminal is the first cell.
In one possible design, the delay information obtaining module is further configured to:
before the first time delay information of the first cell and the second time delay information of the adjacent cell of the first cell are obtained, first sending time delay information sent by a first terminal is obtained, wherein the first sending time delay information comprises time delay information of each cell where the first terminal is located;
and determining the first time delay information and the second time delay information according to the first sending time delay information.
In one possible design, the adjustment determination module is specifically configured to:
acquiring a difference value between the first time delay information and the second time delay information;
if the difference value between the first time delay information and the second time delay information is larger than a preset difference value, determining to adjust the sending time delay information of the first base station;
and if the difference value between the first time delay information and the second time delay information is smaller than or equal to the preset difference value, determining not to adjust the sending time delay information of the first base station.
In one possible design, the delay information obtaining module is further specifically configured to:
selecting second sending delay information from the first sending delay information, wherein the second sending delay information is the first sending delay information sent by a first terminal in an overlapping area, and the overlapping area is an area where the first cell and the adjacent cell are intersected;
acquiring the time delay information of a first cell from the second sending time delay information, and acquiring the first time delay information according to the time delay information of the first cell;
and acquiring the time delay information of the adjacent region from the second sending time delay information, and acquiring the second time delay information according to the time delay information of the adjacent region.
In one possible design, the transmission delay information includes an initial transmission delay, the increased delay information includes an increased delay, and the target transmission delay information includes a target transmission delay;
the delay adjustment module is specifically configured to:
and acquiring the sum of the emission time delay and the increased time delay to obtain the target emission time delay.
In a third aspect, an embodiment of the present invention provides a multicast signal transmitting apparatus, including: at least one processor and memory;
the memory stores computer-executable instructions;
execution of the computer-executable instructions stored by the memory by the at least one processor causes the at least one processor to perform the method of multicast signaling according to any of the first aspects.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer executing instruction is stored, and when a processor executes the computer executing instruction, the method implements the multicast signal sending method according to any one of the first aspect.
The method and apparatus for transmitting a multicast signal provided in an embodiment of the present invention determine whether to adjust transmission delay information of a first base station in a first cell, i.e., determine whether to adjust delay information of a multicast signal transmitted by a first base station, according to first delay information of the first cell and second delay information of an adjacent cell, i.e., determine whether to adjust delay information of a multicast signal transmitted by the first base station, and when it is determined that delay information of a multicast signal transmitted by the first base station needs to be adjusted, indicate that a difference between the first delay information and the second delay information is large, the multicast signal transmitted by the base station in the adjacent cell may be used as an interference signal by a terminal, i.e., may be outside a signal window, and therefore, the first base station needs to adjust transmission delay information of the first base station according to increased delay information, i.e., adjust delay information of the multicast signal transmitted by the base station, so that a difference between the delay information of the multicast signal transmitted by the first base station and the delay information of the multicast signal transmitted by the base station in the adjacent cell is small, when the first base station sends the multicast signal to the first terminal according to the adjusted sending delay information, namely the target sending delay information, the difference between the target sending delay information and the delay information of the multicast signal sent by the base station in the adjacent region is smaller, the multicast signal sent by the base station in the adjacent region can still be used as a useful signal, namely when the first terminal calculates the signal to interference noise ratio, the multicast signal sent by the base station in the adjacent region can be used as a useful signal instead of being used as an interference signal, the obtained signal to interference noise ratio is larger, the terminal can simultaneously demodulate the multicast signal sent by the first base station and the multicast signal sent by the base station in the adjacent region to obtain corresponding video content, and the demodulation capability of the multicast terminal on the multicast signal is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a multicast signal transmission scenario provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a base station cell according to an embodiment of the present invention;
fig. 3 is a first flowchart of a method for sending a multicast signal according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a signal window provided by an embodiment of the present invention;
fig. 5 is a schematic diagram of determining a signal to interference plus noise ratio by a terminal according to an embodiment of the present invention;
fig. 6 is a flowchart of a multicast signal sending method according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a multicast signal transmitting apparatus according to an embodiment of the present invention;
fig. 8 is a schematic hardware structure diagram of a multicast signal transmitting apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Multi-cell broadcasting means that multiple cells transmit the same information, and a UE receiver, i.e., a terminal, can efficiently use signal power from the multiple cells, thereby greatly improving coverage. By transmitting the same signal (same content, same coding and modulation) in multiple cells and synchronizing the transmission times between the cells, the UE receives a signal as if it were received from one single cell and experiences multipath transmission. Such multi-cell transmission, referred to as MBSFN (Multicast/Broadcast Single-Frequency Network) transmission in 3GPP, not only improves the strength of received signals, but also eliminates inter-cell interference (inter-cell interference) because signals received from neighboring cells are useful signals rather than interference signals.
Fig. 1 is a schematic view of a multicast signal transmission scenario provided in an embodiment of the present invention, as shown in fig. 1, a terminal may receive a multicast signal transmitted by a first base station 102 in a local area, and may also receive a multicast signal transmitted by a second base station 103 in an adjacent area, and a terminal 101 may demodulate the multicast signal transmitted by the first base station 102 and the multicast signal transmitted by the second base station 103 at the same time to obtain corresponding video or audio content.
The Multicast signal may be an evolved Multimedia Broadcast Multicast Service (eMBMS) signal.
In the prior art, when a terminal demodulates a multicast signal sent by a base station of a cell and a multicast signal sent by a second base station, a signal-to-interference ratio is calculated according to the multicast signal in a signal window, but because the length of the signal window is limited, only a signal with a certain time delay can be demodulated, when the time delay of the multicast signal sent by the second base station received by the terminal is large, and when the signal-to-interference ratio is calculated, the multicast signal is used as an interference signal, the obtained signal-to-interference ratio is small, the terminal cannot demodulate the multicast signal sent by the second base station, and the demodulation capability of the terminal on the multicast signal is reduced.
When the terminal is in the overlapping area between the local cell and the neighboring cell, the terminal may receive base station signals sent by the base station in the local cell and the base station in the neighboring cell, for example, when the terminal is in the overlapping area between the first cell and the second cell in fig. 2, the terminal may receive a multicast signal sent by the base station in the first cell and a multicast signal sent by the base station in the second cell.
In order to solve the problems in the prior art, the present application provides a method for sending a multicast signal, which determines whether to adjust transmission delay information of a first base station in a first cell, i.e., determine whether to adjust delay information of a multicast signal sent by the first base station, by using first delay information of the first cell and second delay information of an adjacent cell, i.e., determining whether to adjust delay information of the multicast signal sent by the first base station, and when it is determined that the delay information of the multicast signal sent by the first base station needs to be adjusted, it indicates that the first delay information and the second delay information have a large difference, and the multicast signal sent by the base station in the adjacent cell may be used as an interference signal by a terminal, i.e., may be outside a signal window When the first base station sends the multicast signal to the first terminal according to the adjusted sending delay information, namely the target sending delay information, the difference between the target sending delay information and the delay information of the multicast signal sent by the base station in the adjacent region is small, the multicast signal sent by the base station in the adjacent region can still be used as a useful signal, namely when the first terminal calculates the signal to interference and noise ratio, the multicast signal sent by the base station in the adjacent region can be used as the useful signal instead of being used as an interference signal, the obtained signal to interference and noise ratio is large, the terminal can simultaneously demodulate the multicast signal sent by the first base station and the multicast signal sent by the base station in the adjacent region to obtain corresponding video content, and the demodulation capability of the terminal on the multicast signal is improved.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 3 is a first flowchart of a method for sending a multicast signal according to an embodiment of the present invention, where an executing entity in the method according to the embodiment may be the first base station in fig. 1. As shown in fig. 3, the method of this embodiment may include:
s301, first time delay information of a first cell and second time delay information of a neighboring cell of the first cell are obtained, wherein the first cell is a cell where a first base station is located.
In this embodiment, a cell where the first base station is located, that is, a cell served and covered by the first base station, is taken as the first cell, and a neighboring cell of the first cell is a neighboring cell of the first cell. And acquiring first time delay information of the first cell and second time delay information of a neighboring cell of the first cell.
The first delay information is determined according to a transmission delay reported by a first terminal in the first cell, and represents a delay required for receiving a multicast signal from a first base station to the first terminal in the first cell. The current serving cell of the first terminal is the first cell.
When the first terminal is in the overlapping area between the first cell and the neighboring cell, it will also receive a signal sent by the second base station in the neighboring cell, and correspondingly, the transmission delay reported by the first terminal also includes a delay required for the first terminal to receive the multicast signal from the start of sending the multicast signal by the second base station, that is, the second delay information may also be determined according to the transmission delay reported by the first terminal, which represents a delay required for the second base station to send the multicast signal to the terminal in the first cell.
For convenience of description, the first terminal in the overlapping area of the first cell and the neighboring cell may be referred to as a second terminal.
And S302, judging whether to adjust the sending delay information of the first base station according to the first delay information and the second delay information.
In this embodiment, it is determined whether the difference between the first delay information and the second delay information is large according to the first delay information corresponding to the first cell and the second delay information corresponding to the neighboring cell of the first cell, and if the difference is large, it indicates that the second terminal may receive the multicast signal sent by the second base station in the neighboring cell, but the second terminal may be outside a signal window and may be considered as an interference signal.
Optionally, determining whether to adjust the transmission delay information of the first base station according to the first delay information and the second delay information includes:
and acquiring a difference value between the first time delay information and the second time delay information.
And if the difference value between the first time delay information and the second time delay information is larger than the preset difference value, determining to adjust the sending time delay information of the first base station.
And if the difference value between the first time delay information and the second time delay information is smaller than or equal to a preset difference value, determining not to adjust the sending time delay information of the first base station.
In this embodiment, a difference between the first delay information and the second delay information is calculated, that is, a difference between the first delay and the second delay is calculated, and when the difference is greater than a preset difference, it indicates that a difference between a delay of a multicast signal sent by the first base station and a delay of a multicast signal sent by the second base station is relatively large, and the multicast signal sent by the second base station may not be within a signal window.
When the difference is smaller than or equal to the preset difference, it indicates that the difference between the time delay of the multicast signal sent by the first base station and the time delay of the multicast signal sent by the second base station is smaller, and the multicast signal sent by the second base station can be in a signal window, so that the sending time delay information of the first base station does not need to be adjusted.
And S303, if the sending delay information of the first base station is adjusted, obtaining the increasing delay information, and adjusting the sending delay information according to the increasing delay information to obtain the target sending delay information.
In this embodiment, when it is determined that the transmission delay information of the first base station needs to be adjusted, it indicates that the difference between the first delay information and the second delay information is large, that is, the delay information of the multicast signal transmitted by the first base station and the delay information of the multicast signal transmitted by the base station in the neighboring cell are large, and when the first base station calculates the signal to interference and noise ratio according to the multicast signal transmitted by the first base station and the multicast signal transmitted by the base station in the neighboring cell, the multicast signal transmitted by the base station in the neighboring cell may be outside a signal window, as shown in the multicast signal S5 in fig. 4, that is, the multicast signal S5 is regarded as an interference signal by the first terminal, and the calculated signal to interference and noise ratio is small. When the delay information of the multicast signal sent by the first base station is adjusted, the increased delay information is obtained, the sending delay information is adjusted according to the increased delay information, so that the delay information of the multicast signal sent by the first base station is increased according to the increased delay information, and the target sending delay information is obtained.
The sending delay information comprises initial transmission delay and transmission delay. The transmission delay is a time length required for the first base station to transmit the multicast signal, that is, an air interface transmission time of the first base station. The transmission delay is a time length required for the multicast signal to be transmitted from the first base station to the first terminal, that is, the time length from the time when the first base station successfully transmits the multicast signal to the time when the first terminal receives the multicast signal. The first base station adjusts the transmission delay of the transmitted multicast signal, i.e. increases the transmission delay.
Wherein, the increasing of the time delay information comprises increasing time delay, and the target sending time delay information comprises target transmitting time delay.
And when the sending delay information is adjusted according to the increasing delay information to obtain the target sending delay information, obtaining the sum of the initial sending delay and the increasing delay to obtain the target sending delay.
In this embodiment, the sum of the transmission delay and the increase delay is calculated to obtain the adjusted transmission delay, that is, the target transmission delay is obtained, where the target transmission delay represents the adjusted time length required for the first base station to transmit the multicast signal, that is, the time required for the first base station to transmit the multicast signal.
S304, according to the target sending delay information, sending a multicast signal to the first terminal, wherein the current service cell of the first terminal is the first cell.
In this embodiment, the target transmission delay is composed of a target transmission delay and a transmission delay. The transmission delay is mainly adjusted when the first base station is adjusted. Therefore, when determining that the multicast signal sent by the first base station needs to be increased, the first base station adjusts the transmission delay to be the target transmission delay, and sends the multicast signal to the first terminal according to the target transmission delay, that is, the transmission delay of the multicast signal is increased to be the target transmission delay, so as to prolong the delay of the multicast signal sent by the first base station, and thus the difference between the delay of the multicast signal sent by the first base station and the delay of the multicast signal sent by the base station in the adjacent area is smaller.
The first terminal receives the multicast signals sent by the first base station and the base stations in the adjacent area, because the difference between the time delay information of the multicast signals sent by the first base station and the multicast signals sent by the base stations in the adjacent area is small, the multicast information sent by the first base station and the multicast signals sent by the base stations in the adjacent area can be in a signal window, the signal-to-interference-and-noise ratio is calculated according to the multicast signals in the signal window, and when the signal-to-interference-and-noise ratio is calculated, because the base stations in the adjacent area are in the signal window, the base stations can be used as useful signals instead of interference signals, the demodulation of the first terminal on the multicast signals sent by the first base station and the base stations in the adjacent area is realized, and the demodulation capability of the first terminal on the multicast signals is improved.
The delay of the first base station in adjusting the transmission is to add a certain delay to a baseband and a Remote Radio Unit (RRU), so as to increase the transmission time of the air interface of the base station, thereby extending the transmission delay of the first base station, that is, extending the time required by the first base station to transmit the base station.
In this embodiment, based on timing tracking, the second terminal may adjust the initial position of the signal window in real time, and therefore, after receiving the multicast signals sent by the base stations in the first cell and the neighboring cell, when the delay difference between the multicast signals of the first cell and the neighboring cell is small, the second terminal may adjust the initial positions of the signal window to place both the multicast signals in the signal window, even if the multicast signals are within the ECP (Extended CP), so that the multicast signals sent by the base stations in the neighboring cell may be used as useful signals. For example, since the multicast signal S5 in the diagram (a) in fig. 5 is outside the signal window and not within the ECP range, when calculating the signal to interference plus noise ratio SINR, the signal to interference plus noise ratio SINR is taken as the interference signal, that is, the multicast signal S5 is taken as the denominator, so that the SINR is small, and the eMBMS demodulation performance of the terminal is reduced, and after the delay of the multicast signal transmitted by the first base station is extended, the delay of the multicast signal transmitted by the first base station is slightly different from the delay of the multicast signal transmitted by the second base station, as shown in the diagram (b) in fig. 5, both the multicast signals transmitted may be within the signal window, that is, within the ECP range, and when calculating the signal to interference plus noise ratio SINR, the multicast signal S5 is taken as a useful signal, that is, the multicast signal S5 is taken as a numerator, so that the SINR is large, and the eMBMS demodulation performance of the terminal is improved.
In this embodiment, the time of the multicast signal received by the terminal is controlled by controlling the transmission delay of the base station, and the multicast signal is controlled within the ECP range, that is, all signal energy is included in the signal window as much as possible, so as to achieve the optimal demodulation signal-to-interference-and-noise ratio.
From the above description, it can be known that, by determining whether to adjust the transmission delay information of the first base station in the first cell, i.e., determining whether to adjust the delay information of the multicast signal transmitted by the first base station, according to the first delay information of the first cell and the second delay information of the neighboring cell, i.e., the delay information of the local cell and the delay information of the neighboring cell, when it is determined that the delay information of the multicast signal transmitted by the first base station needs to be adjusted, it indicates that the first delay information and the second delay information have a large difference, and the multicast signal transmitted by the base station in the neighboring cell may be used as an interference signal by the terminal, i.e., may be outside the signal window, so that the first base station needs to adjust the transmission delay information of the first base station according to the increased delay information, i.e., adjust the delay information of the multicast signal transmitted by the base station, so that the delay information of the multicast signal transmitted by the first base station has a small difference with the delay information of the multicast signal transmitted by the base station in the neighboring cell, when the first base station sends the multicast signal to the first terminal according to the adjusted sending delay information, namely the target sending delay information, the difference between the target sending delay information and the delay information of the multicast signal sent by the base station in the adjacent region is smaller, the multicast signal sent by the base station in the adjacent region can still be used as a useful signal, namely when the first terminal calculates the signal to interference noise ratio, the multicast signal sent by the base station in the adjacent region can be used as a useful signal instead of being used as an interference signal, the obtained signal to interference noise ratio is larger, the terminal can simultaneously demodulate the multicast signal sent by the first base station and the multicast signal sent by the base station in the adjacent region to obtain corresponding video content, and the demodulation capability of the multicast terminal on the multicast signal is improved.
When determining the first delay information and the second delay information, the first delay information and the second delay information are determined according to the first transmission delay information measured by the first base station in the first cell, and a process of determining the first delay information and the second delay information is described in detail below with reference to a specific embodiment.
Fig. 6 is a second flowchart of a method for sending a multicast signal according to an embodiment of the present invention, and this embodiment describes in detail a specific implementation process of determining first delay information and second delay information based on the embodiment of fig. 3. As shown in fig. 6, the method includes:
s601, acquiring first sending delay information sent by a first terminal, wherein the first sending delay information comprises delay information of each cell where the first terminal is located.
In this embodiment, the first terminal measures the delay information of each cell where the first terminal is located, where the current serving cell of the first terminal is the first cell, that is, the current serving base station of the first terminal is the first base station.
When the first terminal can only receive the signal transmitted by the first base station, it measures only the delay information of the first cell, i.e. the delay required by the first base station to transmit the multicast signal to the first terminal.
When the first terminal obtains the first transmission delay information through measurement, the first terminal performs measurement through network optimization information or a set interface. When measuring through the set interface, the terminal sends signals/messages with the base station through the interface to measure the time delay of the base station sending the multicast signals to the terminal. When the measurement is carried out through the network priority information, the time delay of the base station for sending the multicast signal to the terminal is calculated through the position of the base station and the position of the terminal by acquiring the position of the base station in the network priority information.
When the first terminal sends the first transmission delay information to the base station, the first terminal may report the first transmission delay information through an MCE (MAC CE, MAC layer control cell).
When the first terminal can receive not only the signal sent by the first base station but also the signal sent by the base station in the neighboring cell, it indicates that the first terminal is in the overlapping area of the first cell and the neighboring cell, and the first terminal not only measures the delay information of the first cell, but also measures the delay information of the neighboring cell, that is, the delay required for the base station in the neighboring cell to send the multicast signal to the first terminal.
Taking a specific application scenario as an example, as shown in fig. 2, when a terminal is in an overlapping area between a first cell and a second cell, the terminal may receive a multicast signal sent by a base station in the first cell and may also receive a multicast signal sent by a base station in the second cell, and then the terminal is the second terminal. The second terminal measures the time delay information corresponding to the first cell, namely the time delay required by the base station in the first cell to send the multicast signal to the second terminal, and measures the time delay information corresponding to the second cell, namely the time delay required by the base station in the second cell to send the multicast signal to the second terminal, and then the two time delays are used as the first sending time delay and sent to the current service base station of the second terminal, namely the base station in the first cell.
S602, determining first time delay information and second time delay information according to the first sending time delay information.
In this embodiment, after obtaining the first transmission delay information sent by the first terminal, the first delay information, that is, the time length required for the base station in the first cell to send the multicast signal to the second terminal, and the second delay information, that is, the time length required for the base station in the neighboring cell to send the multicast signal to the second terminal, may be determined.
Optionally, determining the first delay information and the second delay information according to the first sending delay information includes:
and selecting second sending time delay information from the first sending time delay information, wherein the second sending time delay information is the first sending time delay information sent by the first terminal in an overlapping area, and the overlapping area is an area where the first cell and the adjacent cell are intersected.
And acquiring the time delay information of the first cell from the second sending time delay information, and acquiring the first time delay information according to the time delay information of the first cell.
And acquiring the time delay information of the adjacent region from the second sending time delay information, and acquiring the second time delay information according to the time delay information of the adjacent region.
In this embodiment, first transmission delay information sent by a second terminal, which is a first terminal in an overlapping area, is searched from first transmission delay information to obtain second transmission delay information, where the second transmission delay information includes delay information of a first cell and delay information of a neighboring cell, the delay information of the first cell indicates a delay required by a first base station in the first cell to send a multicast signal to the second terminal, and the delay information of the neighboring cell indicates a delay required by a base station in the neighboring cell to send a signal to the second terminal.
After the time delay information of the first cell and the time delay information of the neighboring cell sent by each second terminal are obtained, the first time delay information may be determined according to the time delay information of the first cell sent by each second terminal, and the second time delay information may be determined according to the time delay information of the neighboring cell.
When the first delay information is determined according to the delay information of the first cell sent by each second terminal, the first delay information can be determined by an average value, that is, the average value of the delay information of the first cell sent by all the second terminals is calculated to obtain the first delay information. Correspondingly, the second delay information may also be obtained by calculating an average value of the delay information of the neighboring cells sent by each second terminal.
Taking a specific application scenario as an example, there are 2 second terminals in an overlapping area of a first cell and a second cell in fig. 2, which are terminal 1 and terminal 2, respectively, where a time length measured by terminal 1, which is required by a first base station in the first cell to send a multicast signal to terminal 1, is a1, that is, a time delay information of the first cell is a1, a time length required by the first base station in the second cell to send the multicast signal to terminal 1 is b1, that is, a time delay information of an adjacent cell is b2, correspondingly, the time delay information of the first cell corresponding to terminal 2 is a2, the time delay information of the adjacent cell is b2, the first time delay information is (a1+ a2)/2, and the second time delay information is (b1+ b 2)/2.
S603, first time delay information of the first cell and second time delay information of a neighboring cell of the first cell are obtained, wherein the first cell is a cell where the first base station is located.
S604, judging whether to adjust the sending time delay information of the first base station according to the first time delay information and the second time delay information.
And S605, if the sending delay information of the first base station is adjusted, acquiring the increasing delay information, and adjusting the sending delay information according to the increasing delay information to obtain the target sending delay information.
And S606, sending a multicast signal to the first terminal according to the target sending delay information, wherein the current service cell of the first terminal is the first cell.
The implementation processes of S603 to S606 are similar to the implementation processes of S301 to S304 in the embodiment of fig. 3, and are not described herein again.
In this embodiment, the time delay information of the first cell and the neighboring cell is accurately measured by the terminal in the first cell and is uploaded to the first base station, so that the first base station determines the first time delay information, that is, the time delay information of the local cell, and determines the second time delay information, that is, the time delay information of the neighboring cell, according to the measured time delay information.
Fig. 7 is a schematic structural diagram of a multicast signal transmitting apparatus according to an embodiment of the present invention, which is applied to a first base station, as shown in fig. 7, the multicast signal transmitting apparatus 700 may include: a delay information obtaining module 701, an adjustment determining module 702, a delay adjusting module 703 and a signal sending module 704.
The delay information obtaining module 701 is configured to obtain first delay information of a first cell and second delay information of a neighboring cell of the first cell, where the first cell is a cell where a first base station is located.
An adjustment determining module 702, configured to determine whether to adjust the transmission delay information of the first base station according to the first delay information and the second delay information.
The delay adjusting module 703 is configured to obtain the increased delay information if the transmission delay information of the first base station is adjusted, and adjust the transmission delay information according to the increased delay information to obtain the target transmission delay information.
A signal sending module 704, configured to send a multicast signal to a first terminal according to the target sending delay information, where a current serving cell of the first terminal is a first cell.
In one possible design, the delay information obtaining module is further configured to:
before acquiring first time delay information of a first cell and second time delay information of a neighboring cell of the first cell, acquiring first transmission time delay information sent by a first terminal, wherein the first transmission time delay information comprises time delay information of each cell where the first terminal is located.
And determining the first time delay information and the second time delay information according to the first sending time delay information.
In one possible design, the adjustment determination module is specifically configured to:
and acquiring a difference value between the first time delay information and the second time delay information.
And if the difference value between the first time delay information and the second time delay information is larger than the preset difference value, determining to adjust the sending time delay information of the first base station.
And if the difference value between the first time delay information and the second time delay information is smaller than or equal to a preset difference value, determining not to adjust the sending time delay information of the first base station.
In one possible design, the delay information obtaining module is further specifically configured to:
and selecting second sending time delay information from the first sending time delay information, wherein the second sending time delay information is the first sending time delay information sent by the first terminal in an overlapping area, and the overlapping area is an area where the first cell and the adjacent cell are intersected.
And acquiring the time delay information of the first cell from the second sending time delay information, and acquiring the first time delay information according to the time delay information of the first cell.
And acquiring the time delay information of the adjacent region from the second sending time delay information, and acquiring the second time delay information according to the time delay information of the adjacent region.
In one possible design, the transmit delay information includes an initial transmit delay, the add delay information includes an add delay, and the target transmit delay information includes a target transmit delay.
The delay adjustment module is specifically configured to:
and acquiring the sum of the initial transmission time delay and the increased time delay to obtain the target transmission time delay.
The multicast signal sending device provided in the embodiment of the present invention can implement the multicast signal sending method in the above-described embodiment, and the implementation principle and technical effect are similar, which are not described herein again.
Fig. 8 is a schematic hardware structure diagram of a multicast signal transmitting apparatus according to an embodiment of the present invention. As shown in fig. 8, the multicast signal transmitting apparatus 800 provided in the present embodiment includes: at least one processor 801 and a memory 802. The processor 801 and the memory 802 are connected by a bus 803.
In a specific implementation process, the at least one processor 801 executes the computer-executable instructions stored in the memory 802, so that the at least one processor 801 executes the multicast signal transmission method in the above method embodiment.
For the specific implementation process of the processor 801, reference may be made to the above method embodiments, which implement principles and technical effects similar to each other, and details are not described herein again.
In the embodiment shown in fig. 8, it should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose processors, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The memory may comprise high speed RAM memory, and may also include non-volatile storage NVM, such as at least one disk memory.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer execution instruction is stored in the computer-readable storage medium, and when a processor executes the computer execution instruction, the multicast signal sending method according to the above method embodiment is implemented.
The computer-readable storage medium may be implemented by any type of volatile or non-volatile memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk. Readable storage media can be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary readable storage medium is coupled to the processor such the processor can read information from, and write information to, the readable storage medium. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the readable storage medium may also reside as discrete components in the apparatus.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A method for transmitting a multicast signal, applied to a first base station, the method comprising:
acquiring first time delay information of a first cell and second time delay information of a neighboring cell of the first cell, wherein the first cell is a cell where the first base station is located;
judging whether to adjust the sending time delay information of the first base station or not according to the first time delay information and the second time delay information;
if the sending delay information of the first base station is adjusted, obtaining increasing delay information, and adjusting the sending delay information according to the increasing delay information to obtain target sending delay information;
sending the multicast signal to a first terminal according to the target sending delay information, wherein a current service cell of the first terminal is the first cell;
before the obtaining of the first delay information of the first cell and the second delay information of the neighboring cell of the first cell, the method includes:
acquiring first transmission delay information sent by a first terminal, wherein the first transmission delay information comprises delay information of each cell where the first terminal is located;
determining the first time delay information and the second time delay information according to the first sending time delay information;
the determining the first delay information and the second delay information according to the first sending delay information includes:
selecting second sending time delay information from the first sending time delay information, wherein the second sending time delay information is the first sending time delay information sent by a first terminal in an overlapping area, and the overlapping area is an area where the first cell and the adjacent cell are intersected;
acquiring the time delay information of a first cell from the second sending time delay information, and acquiring the first time delay information according to the time delay information of the first cell;
and acquiring the time delay information of the adjacent region from the second sending time delay information, and acquiring the second time delay information according to the time delay information of the adjacent region.
2. The method of claim 1, wherein the determining whether to adjust the transmission delay information of the first base station according to the first delay information and the second delay information comprises:
acquiring a difference value between the first time delay information and the second time delay information;
if the difference value between the first time delay information and the second time delay information is larger than a preset difference value, determining to adjust the sending time delay information of the first base station;
and if the difference value between the first time delay information and the second time delay information is smaller than or equal to the preset difference value, determining not to adjust the sending time delay information of the first base station.
3. The method of any of claims 1-2, wherein the transmission delay information comprises an initial transmission delay, the increased delay information comprises an increased delay, and the target transmission delay information comprises a target transmission delay;
the adjusting the sending delay information according to the increasing delay information to obtain target sending delay information comprises:
and acquiring the sum of the initial transmission time delay and the increased time delay to obtain the target transmission time delay.
4. A multicast signaling apparatus, applied to a first base station, the apparatus comprising:
a delay information obtaining module, configured to obtain first delay information of a first cell and second delay information of a neighboring cell of the first cell, where the first cell is a cell where the first base station is located;
an adjustment determining module, configured to determine whether to adjust the transmission delay information of the first base station according to the first delay information and the second delay information;
a delay adjusting module, configured to obtain increased delay information if the transmission delay information of the first base station is adjusted, and adjust the transmission delay information according to the increased delay information to obtain target transmission delay information;
a signal sending module, configured to send the multicast signal to a first terminal according to the target sending delay information, where a current serving cell of the first terminal is the first cell;
the time delay information acquisition module is further configured to:
before the first time delay information of the first cell and the second time delay information of the adjacent cell of the first cell are obtained, first sending time delay information sent by a first terminal is obtained, wherein the first sending time delay information comprises time delay information of each cell where the first terminal is located;
determining the first time delay information and the second time delay information according to the first sending time delay information;
the delay information obtaining module is further specifically configured to:
selecting second sending time delay information from the first sending time delay information, wherein the second sending time delay information is the first sending time delay information sent by the first terminal in an overlapping area, and the overlapping area is an area where the first cell and the adjacent cell are intersected;
acquiring the time delay information of the first cell from the second sending time delay information, and acquiring the first time delay information according to the time delay information of the first cell;
and acquiring the time delay information of the adjacent region from the second sending time delay information, and acquiring the second time delay information according to the time delay information of the adjacent region.
5. The device of claim 4, wherein the transmit delay information comprises an initial transmit delay, wherein the incremental delay information comprises an incremental delay, and wherein the target transmit delay information comprises a target transmit delay;
the delay adjustment module is specifically configured to: and acquiring the sum of the initial transmission time delay and the increased time delay to obtain the target transmission time delay.
6. A multicast signal transmission apparatus, comprising: at least one processor and a memory;
the memory stores computer-executable instructions;
execution of the computer-executable instructions stored by the memory by the at least one processor causes the at least one processor to perform the method for multicast signaling according to any of claims 1 to 3.
7. A computer-readable storage medium having computer-executable instructions stored therein, which when executed by a processor, implement the multicast signal transmission method according to any one of claims 1 to 3.
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| US20050136910A1 (en) * | 2003-12-18 | 2005-06-23 | Qinghua Li | Multicast SDMA training polls |
| CN100450199C (en) * | 2004-10-21 | 2009-01-07 | 华为技术有限公司 | System and method for realizing wireless broadcast multicast service synchronizing delivery |
| CN100441046C (en) * | 2005-04-27 | 2008-12-03 | 华为技术有限公司 | Exception frequency/system measuring method and determining method of its measuring performance requirement |
| KR101310908B1 (en) * | 2009-12-15 | 2013-10-14 | 한국전자통신연구원 | Method and apparatus for demodulating multicast signal |
| CN102076098B (en) * | 2010-12-03 | 2015-09-16 | 中兴通讯股份有限公司 | Obtain the method and system of Downlink Control Information in MBSFN sub-frame |
| CN102761836B (en) * | 2011-04-28 | 2016-04-27 | 中国移动通信集团公司 | The method and apparatus of descending trunking communication |
| CN103313196B (en) * | 2012-03-07 | 2016-02-03 | 鼎桥通信技术有限公司 | SPS Activiation method, base station and trunked communication system |
| CN104602197B (en) * | 2013-10-30 | 2018-11-02 | 电信科学技术研究院 | A kind of method communicated, system and equipment |
| CN104717753B (en) * | 2013-12-17 | 2019-09-13 | 北京三星通信技术研究有限公司 | A kind of nonopiate communication means, base station and terminal |
| CN105792346A (en) * | 2016-03-04 | 2016-07-20 | 海能达通信股份有限公司 | Synchronization method, node device and wireless MESH network system |
| CN109151920B (en) * | 2017-06-16 | 2021-07-20 | 成都鼎桥通信技术有限公司 | Method for transmitting synchronization signal and base station |
| CN108631946A (en) * | 2018-05-14 | 2018-10-09 | 海能达通信股份有限公司 | A kind of delay adjusting method and relevant device |
| CN110798809B (en) * | 2018-08-02 | 2021-07-23 | 成都鼎桥通信技术有限公司 | Time delay estimation method and device |
| CN110798808B (en) * | 2018-08-02 | 2021-07-23 | 成都鼎桥通信技术有限公司 | Timing method and device for multicast terminal demodulation |
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