CN110602776B

CN110602776B - Reference Signal Received Power (RSRP) measuring method and device for direct link

Info

Publication number: CN110602776B
Application number: CN201910943718.7A
Authority: CN
Inventors: 沈兴亚; 曲鑫
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2021-10-29
Anticipated expiration: 2039-09-30
Also published as: WO2021063195A1; CN110602776A

Abstract

The disclosure relates to a Reference Signal Received Power (RSRP) measuring method and device for a direct link. The method configures measurement information of direct link RSRP at a V2X sending end according to the measurement information of the downlink RSRP, configures a measurement period of the downlink RSRP to be integral multiple of the measurement period of the direct link RSRP, and aligns starting positions of one or more measurement periods of the direct link RSRP at the V2X sending end with the starting position of the measurement period of the downlink RSRP or aligns ending positions of one or more measurement periods of the direct link RSRP at the V2X sending end with the ending position of the measurement period of the downlink RSRP. According to the measuring method disclosed by the invention, the sending power of the V2X sending end can be kept unchanged in the measuring period of the RSRP of the direct link, and the accuracy of the measuring result of the RSRP of the direct link is ensured.

Description

Reference Signal Received Power (RSRP) measuring method and device for direct link

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a method and an apparatus for measuring reference signal received power RSRP of a direct link.

Background

In Release 12, LTE (Long Term Evolution) introduced Direct Communication (ProSe Direct Communication). UE (User Equipment) a and UE B (may be multiple UEs) may communicate directly through a PC5 interface, where the PC5 interface is a direct interface between UEs.

There are two modes of resource allocation, one is a scheduled resource allocation (scheduled resource allocation), which is configured by the base station through dedicated signaling; one is an automatic Resource selection (automatic Resource selection), in which a base station may provide a Resource pool for direct communication to a UE through a system message or a Radio Resource Control (RRC) signaling, and the UE may select a Resource for direct communication from the Resource pool. If the transmitting UE (transmitter UE) is not in the network coverage, the UE may select resources for direct communication from a pre-configured resource pool in an automatic resource selection manner.

Based on direct communication, 3GPP also supports Vehicle networking (V2X). Fig. 1 shows a V2X scenario, in which a UE transmits V2X messages to multiple UEs in the coverage of a network, as shown in fig. 1. It should be noted that both the receiving UE and the sending UE may not be within the network coverage, or some UEs may be within the network coverage.

Currently, 3GPP (The 3rd Generation Partnership Project, third Generation Partnership Project) is investigating The introduction of V2X in 5G (i.e., New Radio, NR). Because the 5G system can provide larger bandwidth and lower time delay, the service requirement of V2X can be better met. And 3GPP has agreed that NR V2X may transmit V2X traffic in unicast, multicast or broadcast manner, and when transmitting UE in unicast or group pc, feedback may be introduced.

In LTE, if a UE performing V2X transmission performs V2X transmission using a transmission resource configured by a serving cell, power control needs to be performed, and transmission cannot be performed according to the maximum power that the UE can transmit, but the effect on the serving cell needs to be considered, so the V2X transmission power needs to take min.

The calculation expression of the transmission power of the transmitting UE is as follows:

wherein M is the number of PSSCH or PSCCH resource blocks used by the transmitting UE, PL is the path loss of the serving cell detected by the UE (the UE performs V2X transmission by using the transmission resource provided by the current serving cell), and P is the transmission power of the transmitting UE on the PSSCH_CMAX、α_{O_PSSCH_3}Is a parameter of the higher layer configuration.

Since feedback is not considered in LTE V2X, only unidirectional transmission needs to be considered, and path loss is also unidirectional, the above expression is usedThe transmission power is calculated. However, in NR V2X, feedback needs to be considered, which is a bi-directional transmission. For a pair of V2X UEs (V2X transmit terminal and V2X receive terminal), there are two types of path loss: i.e. downlink path loss PL between the base station and the transmitting end of V2X_gNB-TxDirect link (sidelink) path loss PL between V2X transmitting end and V2X receiving end_Tx-Rx. The current NR V2X power control supports three path loss configurations: supporting only Uu port downlink path loss PL_gNB-TxPL supporting only direct link path loss_Tx-RxAnd simultaneously supports the downlink path loss PL of the Uu port_gNB-TxAnd direct link path loss PL_Tx-Rx. Downlink path loss PL when V2X communication simultaneously supports Uu port_gNB-TxAnd direct link path loss PL_Tx-RxIn time, the V2X transmitting end adopts the smaller value between the two as the parameter for the transmission power calculation.

Wherein the direct link path loss PL_Tx-RxThe path loss PL of the direct link is calculated by the V2X sending terminal based on the RSRP (Reference Signal Receiving Power) of the direct link fed back by the V2X Receiving terminal and the sending Power of the V2X sending terminal_Tx-RxTransmit power-direct link RSRP value.

RSRP for a direct link may consist of two parts: layer 1RSRP and Layer 3 RSRP. The L1RSRP may be seen as an average of one or more measurements over a time window. For example, the multiple measurements are weighted averaged over a 200 millisecond period. L3 RSRP filters L1RSRP in the time domain. The one or more measurement results corresponding to the Layer 1RSRP are physical Layer measurement results. The RSRP of the direct link is measured based on Reference signals sent by a sending end of V2X on the direct link, and the Reference signals may be one or more of Demodulation Reference signals (DMRS) of a physical layer direct link Control Channel (PSCCH), Demodulation Reference signals (DMRS) of a physical layer direct link data Channel (PSCCH), and CSI-RS (Channel state information Reference signals) of the direct link (Sidelink).

The V2X sender, if configured, is based on a downlink path between the base station and the V2X sender at the same timeLoss of PL_gNB-TxAnd direct link calculation PL between V2X sender and V2X receiver_Tx-RxThe transmission power calculation is carried out, and the V2X transmitting end obtains PL each time_gNB-TxAnd PL_Tx-RxThen, a comparison is made, and the smaller value is used as a parameter for the calculation of the transmission power. Wherein PL_Tx-RxIs calculated based on the RSRP of the direct link fed back by the V2X receiving end.

The V2X receiving end measures RSRP of the direct link in a configured measurement period, where the RSRP is measured based on reference signals sent by the V2X sending end on the direct link, and the sending power of the reference signals in a measurement period is determined by the V2X sending end. If they are based on PL at the same time_gNB-TxAnd PL_Tx-RxIf the transmission power of the V2X transmitting end is changed in a measurement period, the RSRP of the direct link measured by the V2X receiving end in a measurement period may be inaccurately calculated if the transmission power of the V2X transmitting end in a measurement period is changed (because the RSRP of the direct link needs to be calculated as one of the parameters), which may cause the direct link path loss calculated by the V2X receiving end to be inaccurate, and further may cause the transmission power of the V2X transmitting end to fail to meet the requirement of power control.

Fig. 2 shows an example of sidelink power control based on downlink path loss or sidelink path loss. As shown in fig. 2, the V2X obtains the Uu port (air interface between the base station and the V2X transmitter) downlink path loss at time T0, obtains the direct link path loss at time T0', determines the current transmission power according to the Uu port downlink path loss and the direct link path loss, and then the transmission power of the V2X transmitter remains unchanged until time T2. And the V2X sender obtains a new downlink path loss again at the time of T2, compares the new downlink path loss with the downlink path loss or the direct link path loss at the time of T0' and determines the current sending power, and then the sending power of the V2X sender is kept unchanged until the time of T2. However, the transmission power of the V2X transmitter in the RSRP measurement period of the V2X receiver may change, for example, different path loss parameters are adopted in the V2X transmitter in time window 1(T0 '-T2) and time window 2 (T2-T2'), which results in different transmission powers. At this time, if the V2X receiving end reports the RSRP value in a measurement period, the V2X transmitting end cannot accurately reconstruct the path loss of the direct link in the measurement period, so that the path loss of the direct link is inaccurate, and the transmitting power cannot meet the power control requirement.

In view of the above analysis, the main problem solved by the present invention is how to ensure the accuracy of RSRP measurement results on a V2X direct link, so as to ensure that the transmission power of a V2X transmitter meets the requirement of power control in an NR V2X scenario.

Disclosure of Invention

In view of this, the present disclosure provides a method and an apparatus for measuring reference signal received power RSRP of a direct link.

According to an aspect of the present disclosure, a reference signal received power, RSRP, measurement method for a direct link is provided, and the method is applied to a V2X transmitting end, and the method includes:

acquiring measurement information of downlink RSRP, and configuring measurement information of direct link RSRP of a V2X sending end, wherein the measurement information of the downlink RSRP comprises one or more of a first measurement period, a first time domain starting position and an ending position, and the measurement information of the direct link RSRP comprises one or more of a second measurement period, a second time domain starting position and an ending position;

the time period from the starting position to the ending position of the first time domain is a first measurement period, and the time period from the starting position to the ending position of the second time domain is a second measurement period;

the first measurement period is N times of the second measurement period, and the first time domain starting position is aligned with N consecutive second time domain starting positions or the first time domain ending position is aligned with N consecutive second time domain ending positions, where N is a positive integer.

According to another aspect of the present disclosure, there is provided a reference signal received power, RSRP, measurement method for a direct link, the method being applied to a V2X transmitting end, the method including:

comparing the currently determined first sending power with a second sending power which is currently and most recently determined before, and if the first sending power is different from the second sending power, sending indication information to a V2X receiving terminal to indicate that a first direct link RSRP and a second direct link RSRP are reported to a V2X sending terminal;

the first direct link RSRP is a direct link RSRP before the sending power is changed, the second direct link RSRP is a direct link RSRP after the sending power is changed, and the first sending power and the second sending power are both the sending power of a V2X sending end.

According to another aspect of the present disclosure, there is provided a reference signal received power, RSRP, measurement method for a direct link, the method being applied to a V2X receiving end, the method comprising:

after the indication information is received, calculating a first direct link RSRP and a second direct link RSRP, wherein the first direct link RSRP is the RSRP of the direct link before the sending power is changed, and the second direct link RSRP is the RSRP of the direct link after the sending power is changed; the indication information is used for indicating that the transmission power is changed;

and reporting the RSRP of the first direct link and the RSRP of the second direct link.

According to another aspect of the present disclosure, there is provided a reference signal received power, RSRP, measurement apparatus for a direct link, the apparatus being applied to a V2X transmitting end, the apparatus comprising:

the configuration module is configured to acquire measurement information of a downlink RSRP, and configure measurement information of a direct link RSRP at a V2X sending end, where the measurement information of the downlink RSRP includes one or more of a first measurement period, a first time domain starting position, and an ending position, and the measurement information of the direct link RSRP includes one or more of a second measurement period, a second time domain starting position, and an ending position;

the indication module is used for comparing a first sending power which is determined currently with a second sending power which is determined at the latest time before the current time, and if the first sending power is different from the second sending power, sending indication information to a V2X receiving terminal to indicate that a first direct link RSRP and a second direct link RSRP are reported to a V2X sending terminal;

According to another aspect of the present disclosure, there is provided a reference signal received power, RSRP, measurement apparatus for a direct link, the apparatus being applied to a V2X receiving end, the apparatus comprising:

the RSRP calculating module is used for calculating a first direct link RSRP and a second direct link RSRP after receiving the indication information, wherein the first direct link RSRP is the RSRP of the direct link before the change of the sending power, and the second direct link RSRP is the RSRP of the direct link after the change of the sending power; the indication information is used for indicating that the transmission power is changed;

and the first reporting module is used for reporting the RSRP of the first direct link and the RSRP of the second direct link.

According to another aspect of the present disclosure, there is provided a measurement apparatus for direct link RSRP, comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to perform the above method.

According to another aspect of the present disclosure, there is provided a non-transitory computer readable storage medium having computer program instructions stored thereon, wherein the computer program instructions, when executed by a processor, implement the above-described method.

The method comprises the steps of configuring measurement information of direct link RSRP of a V2X sending end according to the measurement information of the downlink RSRP, configuring a measurement period of the downlink RSRP to be integral multiples of the measurement period of the direct link RSRP, and aligning a starting position of one or more measurement periods of the direct link RSRP of the V2X sending end with a starting position of the measurement period of the downlink RSRP or aligning an ending position of one or more measurement periods of the direct link RSRP of the V2X sending end with an ending position of the measurement period of the downlink RSRP. According to the method for measuring the RSRP of the direct link, through the configuration process, the sending power of the V2X sending terminal can be kept unchanged in a measuring period of the RSRP of the direct link, and the accuracy of the measuring result of the RSRP of the direct link is guaranteed.

Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.

Fig. 1 shows a scenario of V2X.

Fig. 2 shows an example of sidelink power control based on downlink or direct link path loss.

Fig. 3 shows a schematic diagram of an application scenario according to an embodiment of the present disclosure.

Fig. 4 shows a schematic diagram of a method for measuring RSRP of a direct link according to an embodiment of the present disclosure.

Fig. 5 shows a schematic diagram of a method for measuring RSRP of a direct link according to an embodiment of the present disclosure.

Fig. 6 shows an interaction diagram of a method of measuring RSRP of a direct link according to an embodiment of the present disclosure.

Fig. 7 shows a block diagram of a RSRP measurement device for a direct link according to an embodiment of the present disclosure.

Fig. 8 shows a block diagram of a RSRP measurement device for a direct link according to an embodiment of the present disclosure.

Fig. 9 shows a block diagram of a RSRP measurement device for a direct link according to an embodiment of the present disclosure.

Detailed Description

Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.

In order to solve the technical problem, the present disclosure provides a reference signal received power, RSRP, measurement method for a direct link, which may be applied to a V2X transmitting end, and the method may include:

acquiring measurement information of downlink RSRP, and configuring measurement information of direct link RSRP of a V2X sending end, wherein the measurement information of the downlink RSRP comprises one or more of a first measurement period and a first time domain starting and ending position, and the measurement information of the direct link RSRP comprises one or more of a second measurement period and a second time domain starting and ending position;

the time period from the starting position to the ending position of the first time domain is a first measurement period, and the time period from the starting position to the ending position of the second time domain is a second measurement period; the first measurement period is N times of the second measurement period, N is a positive integer, and the first time domain starting position is aligned with N consecutive second time domain starting positions or the first time domain ending position is aligned with N consecutive second time domain ending positions.

In one possible implementation, the start position of the measurement period of the downlink RSRP is aligned with the start position of the first measurement period of the N consecutive measurement periods of the direct link RSRP, and the end position is aligned with the end position of the last measurement period of the N consecutive measurement periods of the direct link RSRP.

In a possible implementation manner, the V2X configures measurement information of the direct link RSRP of the V2X sending end according to the downlink RSRP measurement information.

Fig. 3 shows a schematic diagram of an application scenario according to an embodiment of the present disclosure. As shown in fig. 3, the downlink may refer to a downlink between the base station 1 and the V2X sender 2, and the direct link may refer to a link between the V2X sender 2 and the V2X receiver 3.

In one possible implementation, the downlink is a downlink between an NR base station and a V2X transmitting end, or a downlink between an LTE base station and a V2X transmitting end.

The first measurement period may refer to a period in which the V2X sender 2 measures downlink RSRP, and the second measurement period may refer to a period in which the V2X sender 2 measures direct link RSRP. The first measurement period may be a measurement period configured by the network side, or a measurement period generated by the V2X transmitting end, or the first measurement period is calculated according to the measurement period configured by the network side and a measurement period generated by the V2X transmitting end, and a unit of the measurement period may be milliseconds.

The time period from the start position to the end position of the first time domain defines a time window, and the time length corresponding to the time window is a first measurement period. Similarly, a time window is defined by a time period from the start position to the end position of the second time domain, and a time length corresponding to the time window is a second measurement period. The start position of the first time domain or the second time domain may be determined by a bias parameter. The offset parameter may be a remainder of an integer division of a first system frame number of the first time domain or a first system frame number of the second time domain and a frame number included in one measurement period. For example, the start position of the first time domain may be represented as a remainder obtained by dividing a first system frame number corresponding to the first time domain by a number of frames included in one measurement period.

In a possible implementation manner, a V2X sending end 2 may first obtain measurement information of downlink RSRP, and specifically, the obtaining manner may be that a network side configures the measurement information of downlink RSRP through a high-level signaling; the network side can be an NR base station gNB or an LTE base station eNB; the higher layer signaling may be radio Resource control rrc (radio Resource control) signaling or MAC CE. For example, the measurement period of the downlink RSRP may be 100, 200, 300, … …, 1000 milliseconds, etc., and is not limited herein. The start or end position of the first time domain is determined by a bias parameter, which is not specifically limited herein.

In a possible implementation manner, the V2X sender 2 may first acquire the measurement information of the downlink RSRP, and the specific acquisition manner may be predefined, for example, specified in advance in a standard. For example, the measurement period of the downlink RSRP may be 100, 200, 300, … …, 1000 milliseconds, etc., and is not limited herein. The start or end position of the first time domain is determined by an offset value, which is not specifically limited herein.

After the measurement information of the downlink RSRP is obtained, the measurement information of the direct link RSRP at the transmitting end of V2X may be configured according to the measurement information of the downlink RSRP, and as described above, the measurement period of the downlink RSRP may be set to be an integer multiple of the measurement period of the direct link RSRP, that is, the measurement period of the direct link RSRP is 1/N of the measurement period of the downlink RSRP at the transmitting end of V2X, where N is a positive integer.

In one possible implementation, a multiple of the first measurement period relative to the second measurement period may be predefined. That is, the measurement period of the downlink RSRP may be predefined relative to a multiple of the measurement period of the direct link RSRP. In other words, the value of N may be predefined, for example, N may be a positive integer, and the like, which is not limited in this disclosure.

If the measurement information of the downlink RSRP includes the start or end position of the first time domain, the V2X sending end may further set the start or end position of the measurement period of the direct link RSRP of the V2X sending end according to the start or end position of the measurement period of the downlink RSRP. For example, if the measurement information of the downlink RSRP includes the start position of the measurement period of the downlink RSRP, the start position of the measurement period of the direct link RSRP at the V2X sender may be aligned with the start position of the measurement period of the downlink RSRP; or, if the measurement information of the downlink RSRP includes the end position of the measurement period of the downlink RSRP, the end position of the measurement period of the direct link RSRP at the V2X sender may be aligned with the end position of the measurement period of the downlink RSRP.

For the case where N is 1, the start position of the measurement period of the direct link RSRP is aligned with the start position of the measurement period of the downlink RSRP, and the end position of the measurement period of the direct link RSRP is also aligned with the end position of the measurement period of the downlink RSRP. When N is a value of 2 or more, the start position of the measurement period of the downlink RSRP is aligned with the start position of the first measurement period of the plurality of consecutive measurement periods of the direct link RSRP, and the end position is aligned with the end position of the last measurement period of the plurality of consecutive measurement periods of the direct link RSRP.

Fig. 4 shows a schematic diagram of a method for measuring a direct link RSRP according to an embodiment of the present disclosure. As shown in fig. 4, the top is two different examples of the measurement period and the start and end positions of the measurement period for the downlink RSRP at the V2X transmitter, and the middle and bottom are two different examples of the measurement period and the start and end positions of the measurement period for the direct link RSRP at the V2X transmitter. In the example shown in the middle, the measurement period of the direct link RSRP at the V2X transmitter is the same as the measurement period of the downlink RSRP at the V2X transmitter, and the start position and the end position of the measurement period are also the same. In the lowermost example, the measurement period of the direct link RSRP at the V2X transmitter is 1/2 of the measurement period of the downlink RSRP at the V2X transmitter, and the starting positions of the measurement periods are the same.

For the explanation of the two previous examples as an example, assuming that the V2X transmitter obtains the Uu downlink path loss measurement result and the direct link path loss measurement result at time T2, and determines the current transmission power according to the downlink path loss measurement result and the direct link path loss measurement result, the transmission power of the V2X transmitter remains unchanged in the next direct link RSRP measurement period (T _ SL _ Mea1_ 2). And at the time of T4, the transmitting end of V2X obtains a new Uu port downlink path loss measurement result and a direct link path loss measurement result, and determines the current transmitting power according to the downlink path loss measurement result and the direct link path loss measurement result. Therefore, in a direct link RSRP measurement period, the transmission power of the V2X transmitter remains unchanged, which can ensure the accuracy of the measurement result of the direct link RSRP, so that the calculated direct link path loss measurement result is accurate for calculating the transmission power of the V2X transmitter in the next period.

Taking the uppermost and lowermost examples as an example, the transmitting end of V2X obtains a new direct link loss measurement result again at time T3, and determines the current transmission power by combining the downlink loss measurement result or the direct link loss measurement result at time T2. Therefore, in a direct link RSRP measurement period (T _ SL _ Mea2_3), the transmission power of the V2X transmitter remains unchanged, which can ensure the accuracy of the measurement result of the direct link RSRP, so that the calculated direct link path loss measurement result is accurate for calculating the transmission power of the transmitter of V2X in the next period.

In a possible implementation manner, the measurement information of the downlink RSRP may further include a filter coefficient in a first measurement period, the measurement information of the direct link RSRP further includes a filter coefficient in a second measurement period, and the filter coefficient of the V2X transmitting end in the second measurement period is related to the filter coefficient of the V2X transmitting end in the first measurement period. For example, the filter coefficients of the V2X transmitting terminal in the second measurement period are a subset of the filter coefficients of the V2X transmitting terminal in the first measurement period. For example, the filter coefficient of the V2X transmitting terminal in the second measuring period is configured to be the same as the filter coefficient of the V2X transmitting terminal in the first measuring period.

The filter coefficients in the first measurement period may include a filter coefficient corresponding to each measurement result of downlink RSRP in the first measurement period, and the filter coefficients in the second measurement period may include a filter coefficient corresponding to each measurement result of direct link RSRP in the second measurement period.

After the V2X receiving end obtains multiple measurement results of the RSRP of the direct link in one measurement period, a filter may be used to filter each measurement result in one measurement period to obtain an RSRP value of the direct link, and the RSRP value is fed back to the V2X sending end. The filter coefficients of the filter at the receiving end of V2X may be configured according to the filter coefficients during the measurement period of the downlink RSRP.

After acquiring the measurement information of the downlink RSRP, the V2X may configure a filter coefficient in a measurement period of the direct link RSRP according to a filter coefficient in a first measurement period in the measurement information of the downlink RSRP. For example, the filter coefficients in the measurement period of the direct link RSRP may be set to be the same as the filter coefficients in the measurement period of the downlink RSRP.

In a possible implementation manner, the V2X configures measurement information of the RSRP of the direct link through a radio resource control RRC of the direct link. For example, the V2X sender may configure a measurement period of the direct link RSRP, a start position or an end position of the measurement period, a filter coefficient within the measurement period, and the like by RRC, and for example, the V2X sender may configure a value of N by RRC to set a multiple of the measurement period of the downlink RSRP relative to the measurement period of the direct link RSRP, thereby configuring the measurement period of the direct link RSRP.

In a possible implementation manner, the value of the direct link RSRP is a weighted average value of each measurement result and a corresponding filter coefficient of the physical layer according to the direct link RSRP. That is to say, after the V2X receiving end measures a plurality of measurement results of the RSRP of the direct link in one measurement period, the plurality of measurement results of the RSRP of the direct link may be weighted by using corresponding filter coefficients and averaged to obtain a weighted average value as the value of the RSRP of the direct link.

In another possible implementation manner, the value of the RSRP of the direct link is a result of an iterative update of the weighted average value by the RRC layer. Taking the above example as an example, further, a result of iterating the weighted average value according to a related iteration method may be used as the value of the RSRP of the direct link.

In order to solve the above technical problem, the present disclosure further provides another embodiment of a method for measuring reference signal received power, RSRP, of a direct link, where the method of this embodiment sends an indication to a V2X receiving end by detecting a change in transmission power, so that the V2X receiving end measures corresponding RSRP of the direct link before and after the change in transmission power, and reports the RSRP of the direct link to a V2X transmitting end. Therefore, even if the transmission power of the V2X sending terminal changes in a measurement period, the V2X sending terminal can still obtain the accurate RSRP of the direct link, so that the accurate path loss of the direct link is calculated, and the transmission power is controlled correctly.

Specifically, at the V2X sending end, the method may include:

comparing the first sending power obtained by current calculation with the second sending power obtained by current latest calculation, and if the first sending power is different from the second sending power, sending indication information to a V2X receiving terminal to indicate the V2X receiving terminal to report a first direct link RSRP and a second direct link RSRP to a V2X sending terminal;

The V2X sending end obtains downlink RSRP and direct link RSRP, corresponding downlink path loss is obtained through calculation according to the downlink RSRP, and corresponding direct link path loss is obtained through calculation according to the direct link RSRP. And determining corresponding transmission power according to the downlink path loss and determining corresponding transmission power according to the direct link path loss, and comparing the transmission power corresponding to the two path loss parameters to select smaller transmission power as the current transmission power of the V2X transmitting terminal.

In the following process, the V2X sending end obtains the updated downlink RSRP or the direct link RSRP, obtains the corresponding updated downlink path loss or the direct link path loss through calculation, and obtains the corresponding updated sending power at the same time. And comparing the current last calculated transmission power with the updated transmission power, and selecting the smaller one as the current calculated transmission power. If the current calculated transmission power and the current latest calculated transmission power before change, the V2X sending terminal sends indication information to the V2X receiving terminal to indicate the V2X receiving terminal to report the first direct link RSRP and the second direct link RSRP to the V2X sending terminal, that is, report the direct link RSRP before the transmission power change and the direct link RSRP after the transmission power change.

In one possible implementation manner, the indication information includes a time when the transmission power of the V2X transmitting end changes. In this way, the V2X receiving end may determine, according to the indication information, a time when the transmission power of the V2X transmitting end changes, and may calculate, according to the time of the change, a direct link RSRP before the time of the change and a direct link RSRP after the time of the change, respectively.

In one possible implementation, the indication information may include one or both of a path loss parameter used for the first transmission power and a path loss parameter used for the second transmission power.

In one possible implementation, the indication information may include one or both of a direct link loss identifier of the V2X sender, a downlink loss identifier of the V2X sender.

The V2X receiving end may obtain, according to the indication information, the path loss parameter used by the first transmission power, the path loss parameter used by the second transmission power, the direct link path loss identifier of the V2X transmitting end, or the downlink path loss identifier of the V2X transmitting end, etc. Then, the V2X receiving end may determine corresponding first link information according to the path loss parameter adopted by the first transmit power, may determine a corresponding first RSRP filter according to the first link information, and may obtain a first direct link RSRP by filtering, by using the first RSRP filter, a plurality of measurement results obtained by measurement before the time when the transmit power changes; the V2X receiving end may determine corresponding second link information according to the path loss parameter used by the second sending power, may determine a corresponding second RSRP filter according to the second link information, and may obtain a second direct link RSRP by filtering, using the second RSRP filter, a plurality of measurement results obtained by measurement after the time when the sending power changes. Of course, the information for determining which filter is used for filtering in the above process may also be a link path loss identifier corresponding to the path loss parameter used by the first transmit power, which is not limited in this disclosure.

In a possible implementation manner, the indication information is carried through a direct link radio resource control RRC signaling, or is carried through a direct link MAC CE, or is carried through a direct link control information SCI. That is, the transmitting end of V2X can carry indication information to the receiving end of V2X through RRC signaling or MAC CE or SCI.

In a possible implementation manner, after receiving the first direct link RSRP and the second direct link RSRP, the V2X sending end calculates a first direct link path loss according to the first direct link RSRP and calculates a second direct link path loss according to the second direct link RSRP. The V2X sender may select one of the first direct link path loss and the second direct link path loss as a parameter for calculating a new first sending power. For example, the larger direct link path loss is selected as one of the parameters for calculating the new transmission power

In another possible implementation manner, after receiving the first direct link RSRP and the second direct link RSRP, the V2X sending end calculates a first direct link path loss according to the first direct link RSRP and calculates a second direct link path loss according to the second direct link RSRP. The V2X sender may select one of the first direct link path loss and the second direct link path loss as a parameter for calculating a new first sending power. For example, a smaller direct link path loss is selected as one of the parameters for calculating the new transmission power.

In another possible implementation manner, the V2X may further calculate a (weighted) average direct link path loss of the first direct link path loss and the second direct link path loss, and use the (weighted) average direct link path loss as one of the parameters for calculating the new first transmission power. For example, the V2X sending end may assign a corresponding weighting coefficient to the direct link path loss corresponding to each measurement window, and a result obtained by weighting and summing the multiple direct link path losses is used as one of the parameters for calculating the new first sending power.

By the reference signal received power RSRP measurement method for the direct link according to the above embodiment, when the transmission power of the V2X transmitter changes, the V2X receiver may be notified in time, so that the V2X receiver may measure the RSRP of the direct link before and after the change and report the RSRP to the V2X transmitter, respectively. Therefore, the V2X sending terminal can obtain the accurate RSRP of the direct link before and after the sending power changes, so that the path loss of the direct link can be accurately calculated, and the calculated sending power can meet the requirement of power control.

For the V2X receiver, the method may include:

after receiving the indication information sent by the V2X sending terminal, calculating a first direct link RSRP and a second direct link RSRP, wherein the first direct link RSRP is the RSRP of the direct link before the sending power is changed, and the second direct link RSRP is the RSRP of the direct link after the sending power is changed; the indication information is used for indicating that the transmission power is changed; in one possible implementation manner, the indication information includes a time when the transmission power of the V2X transmitting end changes.

And reporting the RSRP of the first direct link and the RSRP of the second direct link to the V2X sending terminal.

In one possible implementation, as described above, the indication information includes a time when the transmission power is changed, that is, a time when the transmission power of the V2X transmitting end is changed. Thus, the V2X receiving end can determine the time when the transmission power of the V2X transmitting end changes according to the indication information, and can calculate the RSRP of the direct link before the time of the change and the RSRP of the direct link after the time of the change according to the time of the change, and report the RSRP to the V2X transmitting end. The processing of the V2X after receiving the first direct link RSRP and the second direct link RSRP may refer to the description above, and is not described again.

Or, in another possible implementation manner, the first direct link RSRP is calculated according to a direct link RSRP before the indication information is received, and the second direct link RSRP is calculated according to a direct link RSRP after the indication information is received. That is to say, when the V2X receiving end receives the indication information, it may calculate multiple measurement results of the RSRP of the direct link measured before the period to obtain the RSRP of the first direct link, and use the measurement result of the RSRP of the direct link measured after receiving the indication information as a basis for calculating the RSRP of the second direct link, that is, calculate the measurement result of the RSRP of the direct link measured after receiving the indication information to obtain the RSRP of the second direct link. The specific calculation process may be that the filtering coefficient corresponding to the measurement result of the RSRP of the direct link is used to perform weighting and averaging on the measurement result of the RSRP of the direct link to obtain a weighted average value, and a related iteration method may be further used to perform iteration, and the like, which is not limited in the present disclosure.

In a possible implementation manner, the indication information includes one or both of a path loss parameter adopted by the first transmission power and a path loss parameter adopted by the second transmission power; the indication information includes a direct link path loss identifier of a V2X sender and a downlink path loss identifier of a V2X sender.

The V2X receiving end may obtain, according to the indication information, the path loss parameter used by the first transmission power, the path loss parameter used by the second transmission power, the direct link path loss identifier of the V2X transmitting end, or the downlink path loss identifier of the V2X transmitting end, etc. Then, the V2X receiving end may determine corresponding first link information according to the path loss parameter adopted by the first transmit power, may determine a corresponding first RSRP filter according to the first link information, and may obtain a first direct link RSRP by filtering, by using the first RSRP filter, a plurality of measurement results obtained by measurement before the time when the transmit power changes; the V2X receiving end may determine corresponding second link information according to the path loss parameter used by the second sending power, may determine a corresponding second RSRP filter according to the second link information, and may obtain a second direct link RSRP by filtering, using the second RSRP filter, a plurality of measurement results obtained by measurement after the time when the sending power changes. Of course, the information for determining which filter is used for filtering in the above process may also be a link path loss identifier corresponding to the path loss parameter used by the first transmit power, which is not limited in this disclosure. In one possible implementation, the method may further include:

a receiving end of the V2X may report link information corresponding to a first direct link RSRP and a second direct link RSRP;

the V2X receiving end may report measurement window information corresponding to the RSRP of the first direct link and measurement window information corresponding to the RSRP of the second direct link.

The link information corresponding to the first direct link RSRP and the second direct link RSRP may refer to a direct link or a downlink corresponding to the first direct link RSRP and the second direct link RSRP.

In some scenarios, the V2X sending end may filter the sending power, and therefore, according to the link information corresponding to the first direct link RSRP and the second direct link RSRP reported by the V2X receiving end, a corresponding link, for example, a direct link or a downlink may be determined, and then a filter used for filtering the sending power may be determined, that is, the filter corresponding to the link corresponding to the first direct link RSRP and the second direct link RSRP is used for filtering the calculated sending power.

The measurement window information corresponding to the first direct link RSRP may include measurement start time and end time corresponding to a measurement result of the direct link RSRP adopted for calculating the first direct link RSRP. Similarly, the measurement window information corresponding to the second direct link RSRP may also include measurement start time and end time corresponding to a measurement result of the direct link RSRP used for calculating the second direct link RSRP. That is to say, the RSRP of the first direct link or the RSRP of the second direct link is calculated by using the measurement result of the RSRP of the direct link obtained by measurement for a period of time, and then a window formed by the start time and the end time of the period of time is the measurement window information corresponding to the RSRP of the first direct link or the RSRP of the second direct link.

In a possible implementation manner, the V2X receiving end maintains more than two sets of RSRP filters, at least one set of first RSRP filter is related to the downlink path loss of the V2X sending end, and at least one set of second RSRP filter is related to the path loss of the direct link. As described above, the indication information of the V2X transmitter may include a path loss parameter used by the first transmission power, and the V2X receiver may determine, according to the path loss parameter used by the first transmission power, a filter for filtering the measurement result of the direct link RSRP. For example, if the downlink path loss of the path loss parameter used by the first transmit power is lower, the V2X receiving end may use the first RSRP filter to filter the measurement result of the RSRP of the direct link; if the direct link path loss of the path loss parameter used by the first transmission power is lower than the first transmission power, the V2X receiving end may filter the measurement result of the RSRP of the direct link by using the second RSRP filter.

That is to say, when the path loss parameter adopted by the first transmission power is the downlink path loss, the first RSRP filter is configured to filter the measurement result of the measured RSRP of the direct link; and when the path loss parameter adopted by the first sending power is the path loss of the direct link, the second RSRP filter is used for filtering the measured result of the RSRP of the direct link obtained by measurement.

By maintaining a plurality of sets of RSRP filters and determining the filter used by the V2X receiving end for filtering the measured result of the RSRP of the direct link obtained by measurement according to the path loss parameter adopted by the sending power, the value of the RSRP of the direct link obtained by filtering can be more accurate.

Application example

Fig. 5 shows a schematic diagram of a method for measuring a direct link RSRP according to an embodiment of the present disclosure. Fig. 6 shows an interaction diagram of a method of measuring a direct link RSRP according to an embodiment of the present disclosure. The method for measuring the direct link RSRP of the present disclosure is explained with reference to fig. 5 and 6.

As shown in fig. 5, the V2X obtains the Uu port (air interface between the base station and the V2X transmitter) downlink path loss at time T0, obtains the direct link path loss at time T0', and determines the current transmission power according to the Uu port downlink path loss and the direct link path loss (e.g., determine transmission power 1 according to the downlink path loss, determine transmission power 2 according to the direct link path loss, select the smaller of transmission power 1 and transmission power 2 as the current transmission power, and if the transmission power 2 is smaller, the current transmission power is transmission power 2), then the transmission power of the V2X transmitter remains unchanged until time T2.

The transmitting end obtains a new downlink path loss again at time T2 and V2X, determines the transmission power 3 according to the new downlink path loss, compares the transmission power 3 with the current transmission power at time T0 ', and if the transmission power 3 is smaller than the current transmission power at time T0', the new current transmission power is changed.

1. The V2X transmitting end compares the first transmitting power (transmitting power 3) obtained by current calculation with the second transmitting power (transmitting power 2) obtained by current last calculation, and if the first transmitting power is different from the second transmitting power, it transmits indication information to the V2X receiving end. The indication information may include a time T2 at which the transmission power of the V2X transmitting end is changed. A path loss parameter used for the first transmission power (direct link path loss) and a path loss parameter used for the second transmission power (downlink path loss) may also be included.

2. After the V2X receiving end receives the indication information, the path loss parameter used by the second sending power before T2 is the direct link path loss, so that the RSRP of the direct link measured between T0' and T2 is filtered by using the second RSRP filter to obtain the RSRP of the first direct link. And after T2, the path loss parameter adopted by the first transmission power is downlink path loss, and therefore, for the measurement result of the RSRP of the direct link measured between T2 and T2', the RSRP of the second direct link is obtained by filtering with the first RSRP filter. And the V2X receiving terminal reports the RSRP of the first direct link and the RSRP of the second direct link to the V2X sending terminal.

3. The V2X sending end receives the first direct link RSRP and the second direct link RSRP reported by the V2X receiving end. And the V2X sending end respectively calculates the first direct link path loss according to the first direct link RSRP and calculates the second direct link path loss according to the second direct link RSRP. The V2X sender may select one of the first direct link path loss and the second direct link path loss as a parameter for calculating a new first sending power. For example, a larger direct link loss is selected as one of the parameters for calculating the new transmission power, or a smaller direct link loss is selected as one of the parameters for calculating the new transmission power.

Or, a corresponding weighting coefficient may be given to the direct link path loss corresponding to each measurement window, and a result obtained by weighting and summing the multiple direct link path losses is used as one of the parameters for calculating the new first transmission power. For example, in a measurement period, the transmission power may change more than once, because the V2X receiving end may also report measurement window information corresponding to an RSRP of the first direct link and measurement window information corresponding to an RSRP of the second direct link, if the change is repeated, the measurement window information corresponding to RSRPs of multiple direct links may be reported, for an RSRP of a direct link in each measurement window, a corresponding weighting coefficient may be given or preset, and a result obtained by weighting and summing a path loss of multiple direct links is used as one of parameters for calculating new first transmission power.

The present disclosure also provides an RSRP measurement device of a direct link, and fig. 7 shows a block diagram of the RSRP measurement device of the direct link according to an embodiment of the present disclosure. As shown in fig. 7, the apparatus may be applied to a V2X transmitting end, and the measuring apparatus may include:

a configuration module 71, configured to acquire measurement information of a downlink RSRP, and configure measurement information of a direct link RSRP at a sending end of V2X, where the measurement information of the downlink RSRP includes one or more of a first measurement period, a first time domain starting position, and an ending position, and the measurement information of the direct link RSRP includes one or more of a second measurement period, a second time domain starting position, and an ending position;

In one possible implementation, a multiple of the first measurement period relative to the second measurement period is predefined.

In a possible implementation manner, the measurement information of the downlink RSRP further includes a filter coefficient in a first measurement period, and the measurement information of the direct link RSRP further includes a filter coefficient in a second measurement period, where the filter coefficient in the second measurement period is related to the filter coefficient in the first measurement period.

In one possible implementation, the filter coefficients in the second measurement period are the same as the filter coefficients in the first measurement period.

In a possible implementation manner, the filter coefficients in the second measurement period include a filter coefficient corresponding to each measurement result of the direct link RSRP in the second measurement period.

In a possible implementation manner, the V2X configures measurement information of a direct link RSRP through a direct link radio resource control RRC.

In one possible implementation, the direct link is a link between a V2X sender and a V2X receiver.

The present disclosure also provides a RSRP measurement apparatus for a direct link, where the apparatus is applied to a V2X sender, and the apparatus includes:

an indicating module 72, configured to compare a first sending power currently determined with a second sending power currently determined at the latest previous time, and if the first sending power is different from the second sending power, send an indication message to a V2X receiving end to indicate that a first direct link RSRP and a second direct link RSRP are reported to a V2X sending end;

In one possible implementation manner, the indication information includes one or both of a path loss parameter adopted by the first transmission power and a path loss parameter adopted by the second transmission power.

In one possible implementation, the indication information includes one or both of a direct link loss identifier of the V2X sender, and a downlink loss identifier of the V2X sender.

In one possible implementation manner, the indication information includes a time when the transmission power of the V2X transmitting end changes.

In a possible implementation manner, the indication information is carried through a direct link RRC signaling, or is carried through a direct link MAC CE, or is carried through a direct link control information SCI.

In one possible implementation, the apparatus further includes:

and the path loss calculation module 73 is configured to, after receiving the first direct link RSRP and the second direct link RSRP, calculate a first direct link path loss according to the first direct link RSRP and calculate a second direct link path loss according to the second direct link RSRP.

In one possible implementation, the apparatus further includes:

and a power calculating module 74, configured to calculate a third sending power according to the first direct link path loss and the second direct link path loss, and determine a new sending power according to the third sending power and the first sending power.

Fig. 8 shows a block diagram of a RSRP measurement device for a direct link according to an embodiment of the present disclosure. As shown in fig. 8, the apparatus is applied to a V2X receiving end, and the apparatus includes:

an RSRP calculation module 81, configured to calculate, after receiving the indication information, a first direct link RSRP and a second direct link RSRP, where the first direct link RSRP is a direct link RSRP before the change of the transmission power, and the second direct link RSRP is a direct link RSRP after the change of the transmission power; the indication information is used for indicating that the transmission power is changed;

a first reporting module 82, configured to report the first direct link RSRP and the second direct link RSRP.

In a possible implementation manner, the RSRP of the first direct link is calculated according to the RSRP of the direct link before the indication information is received, and the RSRP of the second direct link is calculated according to the RSRP of the direct link after the indication information is received.

In a possible implementation manner, the indication information includes a direct link path loss identifier and a downlink path loss identifier.

In one possible implementation, the apparatus further includes:

a second reporting module 83, configured to report link information corresponding to the first direct link RSRP and the second direct link RSRP;

a third reporting module 84, configured to report measurement window information corresponding to the RSRP of the first direct link and measurement window information corresponding to the RSRP of the second direct link.

In a possible implementation manner, the V2X receiving end maintains more than two sets of RSRP filters, at least one set of first RSRP filters is related to downlink path loss, and at least one set of second RSRP filters is related to direct link path loss.

In a possible implementation manner, when a path loss parameter adopted by the first transmission power is a downlink path loss, the first RSRP filter is configured to filter a measurement result of an RSRP of a direct link obtained by measurement; and when the path loss parameter adopted by the first sending power is the path loss of the direct link, the second RSRP filter is used for filtering the measured result of the RSRP of the direct link obtained by measurement.

Fig. 9 is a block diagram illustrating an apparatus 800 for RSRP measurement of a direct link, according to an example embodiment. For example, the apparatus 800 may be a vehicle, a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, and the like.

Referring to fig. 9, the apparatus 800 may include one or more of the following components: processing component 802, memory 804, power component 806, multimedia component 808, audio component 810, input/output (I/O) interface 812, sensor component 814, and communication component 816.

The processing component 802 generally controls overall operation of the device 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 802 may include one or more processors 820 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.

The memory 804 is configured to store various types of data to support operations at the apparatus 800. Examples of such data include instructions for any application or method operating on device 800, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 804 may be implemented by any type or combination of volatile or non-volatile memory devices 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 disks.

Power components 806 provide power to the various components of device 800. The power components 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the apparatus 800.

The multimedia component 808 includes a screen that provides an output interface between the device 800 and a user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 808 includes a front facing camera and/or a rear facing camera. The front camera and/or the rear camera may receive external multimedia data when the device 800 is in an operating mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the apparatus 800 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.

The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.

The sensor assembly 814 includes one or more sensors for providing various aspects of state assessment for the device 800. For example, the sensor assembly 814 may detect the open/closed status of the device 800, the relative positioning of components, such as a display and keypad of the device 800, the sensor assembly 814 may also detect a change in the position of the device 800 or a component of the device 800, the presence or absence of user contact with the device 800, the orientation or acceleration/deceleration of the device 800, and a change in the temperature of the device 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

The communication component 816 is configured to facilitate communications between the apparatus 800 and other devices in a wired or wireless manner. The device 800 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

In an exemplary embodiment, the apparatus 800 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.

In an exemplary embodiment, a non-transitory computer-readable storage medium, such as the memory 804, is also provided that includes computer program instructions executable by the processor 820 of the device 800 to perform the above-described methods.

The present disclosure may be systems, methods, and/or computer program products. The computer program product may include a computer-readable storage medium having computer-readable program instructions embodied thereon for causing a processor to implement various aspects of the present disclosure.

The computer readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media as used herein is not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission medium (e.g., optical pulses through a fiber optic cable), or electrical signals transmitted through electrical wires.

The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a respective computing/processing device, or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in the respective computing/processing device.

The computer program instructions for carrying out operations of the present disclosure may be assembler instructions, Instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, the electronic circuitry that can execute the computer-readable program instructions implements aspects of the present disclosure by utilizing the state information of the computer-readable program instructions to personalize the electronic circuitry, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA).

Various aspects of the present disclosure are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.

These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer-readable program instructions may also be stored in a computer-readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer-readable medium storing the instructions comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.

The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A Reference Signal Received Power (RSRP) measurement method of a direct link is applied to a V2X sending end and comprises the following steps:

2. The method of claim 1, wherein a multiple of the first measurement period relative to the second measurement period is predefined.

3. The method of claim 2, wherein the measurement information for the downlink RSRP further comprises filter coefficients during a first measurement period, and wherein the measurement information for the direct link RSRP further comprises filter coefficients during a second measurement period, wherein the filter coefficients during the second measurement period are related to the filter coefficients during the first measurement period.

4. A method according to claim 3, characterized in that the filter coefficients in the second measurement period are the same as the filter coefficients in the first measurement period.

5. The method of claim 3 or 4, wherein the filter coefficients in the second measurement period comprise filter coefficients corresponding to each measurement result of the direct link RSRP in the second measurement period.

6. The method of claim 1, wherein the V2X sender configures measurement information for direct link RSRP via a direct link Radio Resource Control (RRC).

7. The method of claim 1, wherein the direct link is a link between a V2X sender and a V2X receiver.

8. A Reference Signal Received Power (RSRP) measuring device of a direct link is applied to a V2X transmitting end and comprises the following components:

9. The apparatus of claim 8, wherein a multiple of the first measurement period relative to the second measurement period is predefined.

10. The apparatus of claim 9, wherein the measurement information for the downlink RSRP further comprises filter coefficients during a first measurement period, and wherein the measurement information for the direct link RSRP further comprises filter coefficients during a second measurement period, wherein the filter coefficients during the second measurement period are related to the filter coefficients during the first measurement period.

11. The apparatus of claim 10, wherein the filter coefficients in the second measurement period are the same as the filter coefficients in the first measurement period.

12. The apparatus of claim 10 or 11, wherein the filter coefficients in the second measurement period comprise filter coefficients corresponding to each measurement result of the direct link RSRP in the second measurement period.

13. The apparatus of claim 8, wherein the V2X sender configures measurement information of a direct link RSRP through a direct link Radio Resource Control (RRC).

14. The apparatus of claim 8, wherein the direct link is a link between a V2X sender and a V2X receiver.

15. A Reference Signal Received Power (RSRP) measuring device of a direct link is characterized by comprising:

a processor;

a memory for storing processor-executable instructions;

wherein the processor is configured to carry out the method of any one of claims 1 to 7 when executing the instructions.

16. A non-transitory computer readable storage medium having computer program instructions stored thereon, wherein the computer program instructions, when executed by a processor, implement the method of any of claims 1 to 7.