WO2015173632A1 - Method of reducing impact of d2d in-band interference on cellular transmission - Google Patents

Method of reducing impact of d2d in-band interference on cellular transmission Download PDF

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Publication number
WO2015173632A1
WO2015173632A1 PCT/IB2015/000846 IB2015000846W WO2015173632A1 WO 2015173632 A1 WO2015173632 A1 WO 2015173632A1 IB 2015000846 W IB2015000846 W IB 2015000846W WO 2015173632 A1 WO2015173632 A1 WO 2015173632A1
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WO
WIPO (PCT)
Prior art keywords
zone
resource
user equipment
base station
cell
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PCT/IB2015/000846
Other languages
French (fr)
Inventor
Dong Li
Original Assignee
Alcatel Lucent
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Publication date
Application filed by Alcatel Lucent filed Critical Alcatel Lucent
Priority to KR1020167034036A priority Critical patent/KR101914199B1/en
Priority to EP15766229.7A priority patent/EP3141066A1/en
Publication of WO2015173632A1 publication Critical patent/WO2015173632A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup

Definitions

  • the present invention relates to the technology field of wireless communication, and particularly to a method of reducing impact of D2D in-band interference on cellular transmission in base station or user equipment. Background of the invention
  • the D2D signals occupy part of uplink cellular resources (i.e., uplink carriers for FDD and uplink subframes for TDD), as shown in Figure 2 for the case of FDD.
  • the D2D signals will occupy some periodical uplink subframes.
  • the uplink cellular control signals i.e., PUCCH
  • the cellular PUCCH signals have to be multiplexed with D2D signals through FDM, as shown in Figure 2.
  • the uplink PUCCH signals (e.g., ACK/NACK, CQI feedback etc. depending on the PUCCH format) play an important role in supporting the downlink data transmission, the in-band emission interference from D2D signals to the cellular control signals has to be solved.
  • This invention aims to address this technical problem.
  • the solution in the above mentioned patent works well in controlling the in-band emission interference to uplink cellular signals.
  • it has some disadvantages.
  • the main disadvantage is that by using power control, the D2D signal transmission powers are not uniform for different D2D users (the closer to base station, the lower the D2D signal transmission power is), thus the D2D transmission range is not uniform. This is not a desirable property for D2D transmissions. Summary of the invention
  • the present invention proposes a method, implemented in a base station of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission, the method comprises:
  • the base station configuring the D2D resource pool as a resource pool including a first zone and a second zone, wherein the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone.
  • the inventor of the present invention utilizes the base station to divide the D2D resource pool into a resource pool including a first zone and a second zone, wherein the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone.
  • a configuration could divide the D2D resource pool to be configured differently for different user equipments or make the user equipments to autonomously select different resources, so as to reduce impact of D2D in-band interference on cellular transmission effectively.
  • the number of resource blocks in the first zone is smaller than the number of resource blocks in the second zone, or the number of subframes in the first zone is smaller than the number of subframes in the second zone.
  • the size of the first zone and the second zone can be configured to satisfy the requirement of different application scenarios, so as to reduce impact of D2D in-band interference on cellular transmission while the normal communication requirement is not influenced at the same time.
  • the method further comprises:
  • the first group being configured to be only able to use the resources in the restricted D2D resource zone in the first zone for D2D communication while the second group being configured to be able to use the resources in the unrestricted D2D resource zone in the second zone for D2D communication or to use the resources in the first zone and in the second zone for D2D communication.
  • the user equipments are divided into different groups by the base station.
  • the embodiment is illustrative but not limitative.
  • the grouping manner could also be achieved in the way that the user equipments decide by themselves that to which group they belong and in order to control more accurately, the user equipments could be divided into more than two groups. After such a grouping it is optimized that different resource zones are used by different groups such that the impact of D2D in-band interference on cellular transmission is reduced.
  • the second group is configured to be only able to use the unrestricted D2D resource zone in the second zone for D2D communication. In such a manner, the second group is configured to be able to use the resource in the unrestricted D2D resource zone in the second zone for D2D communication and thus the receipt of the PUCCH in the corresponding base station is minimally influenced by the D2D user equipment in the second group.
  • the predetermined rule includes:
  • the base station dividing the user equipments connected therewith into at least two groups based on the strength of the signal sent from a user equipment connected therewith to the base station;
  • the base station dividing the user equipments connected therewith into at least two groups based on the interference degree of the base station caused by the user equipments connected therewith.
  • the first group is the user equipments set in which the strength of signal received from the base station exceeds a first threshold and the second group is the user equipments set in which the strength of signal received from the base station does not exceed a first threshold.
  • the corresponding user equipments could be advantageously and fast divided into groups.
  • a second aspect of the present invention provides a method, implemented in a user equipment of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission, the method comprising:
  • the user equipment determining first location status information associated with the user equipment based on the signal quality of a signal received from the base station communicated therewith;
  • the user equipment could determine first location status information associated with the user equipment based on the signal quality of a signal received from the base station communicated therewith, and then the user equipment could select corresponding D2D resource based on the first location status information. In such a manner, the user equipment could select the D2D resource based on the first location status information orderly rather than that the D2D resource is not controlled to be chosen and only selected unorderly in the prior art.
  • the user equipment further receives configuration information of the resource pool from the base station, and wherein the configuration information of the resource pool includes resource configuration information indicating the first zone and the second zone, and the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone.
  • the user equipment could be informed how the D2D resource pool is allocated by the corresponding base station and the user equipment according to the present invention could select the D2D resource based on the allocation manner so as to reduce impact of D2D in-band interference on cellular transmission.
  • the first location status information includes location status indication information which at least includes a first status and a second status, and wherein the first status indicates that the user equipment locates at the center of a cell and the second status indicates that the user equipment locates at the edge of a cell.
  • location status indication information which at least includes a first status and a second status
  • the first status indicates that the user equipment locates at the center of a cell
  • the second status indicates that the user equipment locates at the edge of a cell.
  • the transmitting power of the user equipment located at the center of a cell is the same as that of the user equipment located at the edge of a cell, or the transmitting power of the user equipment located at the center of a cell is smaller than that of the user equipment located at the edge of a cell.
  • the transmitting power of a user equipment located at the center of a cell and the transmitting power of a user equipment located at the edge of a cell could be the same or different.
  • the same transmitting power could make sure that the D2D user equipments have substantially the same discovery range when neighbor discovery is performing and thus it is beneficial for neighbor discovery.
  • the transmitting power of a user equipment located at the center of a cell and the transmitting power of a user equipment located at the edge of a cell could also be different, for example, the transmitting power of a user equipment located at the center of a cell is smaller than the transmitting power of a user equipment located at the edge of a cell. In such a manner, the impact of D2D in-band interference on cellular transmission could be further reduced.
  • the user equipment is configured to be only able to use the resources in the restricted D2D resource zone in the first zone for D2D communication when the user equipment locates at the center of the cell, while the user equipment is configured to be able to use the resources in the unrestricted D2D resource zone in the second zone for D2D communication or to use the resources in the first zone and in the second zone for D2D communication when the user equipment locates at the edge of the cell.
  • the user equipments could decide by themselves that to which group they belong and such a grouping manner is only illustrative but not limitative. Those skilled in the art should understand that in order to control more accurately the user equipments could be divided into more than two groups. After such a grouping it is optimized that different resource zones are used by different groups such that the impact of D2D in-band interference on cellular transmission is reduced.
  • the user equipment is configured to be only able to use the unrestricted D2D resource zone in the second zone for D2D communication when the user equipment locates at the edge of the cell.
  • the second group is configured to be able to use the resource in the unrestricted D2D resource zone in the second zone for D2D communication and thus the receipt of the PUCCH in the corresponding base station is minimally influenced by the D2D user equipment in the second group.
  • the user equipment when the user equipment locates at the edge of the cell and the user equipment is configured to be able to use the resource in the restricted D2D resource zone and the resource in the unrestricted D2D resource zone in the first zone and in the second zone for D2D communication, the user equipment selects the resource in the restricted D2D resource zone in the first zone for D2D communication with a first probability and selects the resource in the unrestricted D2D resource zone in the second zone for D2D communication with a second probability.
  • the first probability is smaller than the second probability.
  • the first probability is associated with the number of resources in the first zone and the second probability is associated with the number of resources in the second zone.
  • the inventor of the present invention utilizes the base station to divide the D2D resource pool into a resource pool including a first zone and a second zone, wherein the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone.
  • a configuration could divide the D2D resource pool to configure differently for different user equipments or make the user equipment to autonomously select different resources, so as to reduce impact of D2D in-band interference on cellular transmission effectively.
  • Fig. l illustrates a schematic diagram 100 of interference generated due to signal power leakage in the prior art
  • Fig.2 illustrates a schematic diagram 200 of D2D resource pool configuration in the prior art
  • Fig.3 illustrates a schematic diagram 300 of D2D resource pool configuration according to the present invention
  • Fig.4 illustrates a schematic diagram 400 of a particular embodiment of the D2D resource pool configuration in the present invention
  • Fig.5 illustrates a flow chart 500 of a method, implemented in a base station of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission;
  • Fig.6 illustrates a flow chart 600 of a method, implemented in a user equipment of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission.
  • Fig. l illustrates a schematic diagram 100 of interference generated due to signal power leakage in the prior art.
  • Fig. l illustrates a schematic diagram 100 of interference generated due to signal power leakage in the prior art.
  • Fig. l while the useful signal 1 is transmitted, carrier leakage will occur as denoted by the numeral 2 and thus other cellular communication is influenced.
  • Fig.2 illustrates a schematic diagram 200 of D2D resource pool configuration in the prior art.
  • the PUCCH of the cellular network must be transmitted on the uplink grant, and thus the PUCCH of the cellular network and the D2D uplink frame must be frequency multiplexed transmitted. Due to the existence of the carrier leakage as shown in Fig. l , such a configuration must cause that the interference to the receipt of the PUCCH must be uncontrollable.
  • This invention proposes a scheme to address the in-band interference of D2D signal to cellular signals to a large extent.
  • the basic ideas of the invention are as follows.
  • the eNB will suffer from severe in-band interference in decoding the uplink signals (e.g., PUCCH), as mentioned above. If we further consider more details of the in-band interference from D2D signals to PUCCH receiving, we can know that the major interferers of such interference are those D2D UEs that are near eNB.
  • a special region in time
  • the cell center D2D users can only occupy the discovery resource within the special region
  • the other D2D users can occupy any resource of the configured resource pool, or alternatively, the other D2D users preferably occupy the discovery resource outside the special region to reduce collisions with the cell center D2D UEs.
  • the special resource region is named as a restricted D2D resource zone.
  • Fig.3 illustrates a schematic diagram 200 of D2D resource pool configuration according to the present invention.
  • the inventor of the present invention utilizes the base station to divide the D2D resource pool into a resource pool including a first zone and a second zone, wherein the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone.
  • a configuration could divide the D2D resource pool to configure differently for different user equipments or make the user equipment to autonomously select different resources, so as to reduce impact of D2D in-band interference on cellular transmission effectively.
  • Fig.3 is only illustrative and the size of each zone is not configured.
  • Fig.4 illustrates a schematic diagram 400 of a particular embodiment of the D2D resource pool configuration in the present invention. Assume that the D2D resource pool is configured, by the base station, as a periodic successive uplink subframe and it has the following size, namely 44 PRB in frequency domain and 32 subframes in time domain, as shown in Fig.4. Those skilled in the art should understand that these parameters are only illustrative but not limitative.
  • the present invention proposes to configure a restricted zone in the D2D resource pool. The size of this restricted zone should be very limited as shown in Fig. 4.
  • Fig.5 and Fig.6 illustrate flow charts 500, 600 of a method, implemented in a base station or a user equipment of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission.
  • Fig.5 illustrates a flow chart 500 of a method, implemented in a base station of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission.
  • the method comprises at least the following steps: in the method step 510, the base station configures the D2D resource pool as a resource pool including a first zone and a second zone, wherein the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone.
  • the number of resource blocks in the first zone is smaller than that in the second zone, or the number of subframes in the first zone is smaller than that in the second zone.
  • the size of the first zone and the second zone can be configured to satisfy the requirement of different application scenarios, so as to reduce impact of D2D in-band interference on cellular transmission while the normal communication requirement is not influenced at the same time.
  • the method further comprises:
  • the first group being configured to be only able to use the resources in the restricted D2D resource zone in the first zone for D2D communication while the second group being configured to be able to use the resources in the unrestricted D2D resource zone in the second zone for D2D communication or to use the resources in the first zone and in the second zone for D2D communication.
  • the user equipments are divided into different groups by the base station.
  • the embodiment is illustrative but not limitative.
  • the grouping manner could also be achieved in the way that the user equipments decide by themselves that to which group they belong and in order to control more accurately the user equipments could be divided into more than two groups.
  • After such a grouping it is optimized that different resource zones are used by different groups such that the impact of D2D in-band interference on cellular transmission is reduced.
  • the second group is configured to be only able to use the unrestricted D2D resource zone in the second zone for D2D communication.
  • the second group is configured to be able to use the resource in the unrestricted D2D resource zone in the second zone for D2D communication and thus the receipt of the PUCCH in the corresponding base station is minimally influenced by the D2D user equipment in the second group.
  • the predetermined rule includes:
  • the base station dividing the user equipments connected therewith into at least two groups based on the strength of the signal sent from a user equipment connected therewith to the base station;
  • the base station dividing the user equipments connected therewith into at least two groups based on the interference degree of the base station caused by the user equipments connected therewith.
  • the first group is the user equipments set in which the strength of signal received from the base station exceeds a first threshold and the second group is the user equipments set in which the strength of signal received from the base station does not exceed a first threshold.
  • Fig.6 illustrates a flow chart 600 of a method, implemented in a user equipment of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission.
  • the method according to the present invention comprises at least the following two steps, namely in the method step 610, the user equipment determines first location status information associated with the user equipment based on the signal quality of a signal received from the base station communicated therewith; and then in the method step 620, the user equipment performing corresponding D2D resource selection based on the first location status information.
  • the user equipment could determine first location status information associated with the user equipment based on the signal quality of a signal received from the base station communicated therewith, and then the user equipment could select corresponding D2D resource based on the first location status information. In such a manner, the user equipment could select the D2D resource based on the first location status information orderly rather than that the D2D resource is not controlled to be chosen and only selected unorderly.
  • the user equipment further receives configuration information of the resource pool from the base station, and wherein the configuration information of the resource pool includes resource configuration information indicating the first zone and the second zone, and the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone.
  • the user equipment could be informed how the D2D resource pool is allocated by the corresponding base station and the user equipment according to the present invention could select the D2D resource based on the allocation manner so as to reduce impact of D2D in-band interference on cellular transmission.
  • the first location status information includes location status indication information which at least includes a first status and a second status, and wherein the first status indicates that the user equipment locates at the center of a cell and the second status indicates that the user equipment locates at the edge of a cell.
  • location status indication information which at least includes a first status and a second status
  • the first status indicates that the user equipment locates at the center of a cell
  • the second status indicates that the user equipment locates at the edge of a cell.
  • the transmitting power of the user equipment located at the center of a cell is the same as that of the user equipment located at the edge of a cell, or the transmitting power of the user equipment located at the center of a cell is smaller than that of the user equipment located at the edge of a cell.
  • the transmitting power of a user equipment located at the center of a cell and the transmitting power of a user equipment located at the edge of a cell could be the same or different.
  • the same transmitting power could make sure that the D2D user equipments have substantially the same discovery range when neighbor discovery is performing and thus it is beneficial for neighbor discovery.
  • the transmitting power of a user equipment located at the center of a cell and the transmitting power of a user equipment located at the edge of a cell could also be different, for example, the transmitting power of a user equipment located at the center of a cell is smaller than the transmitting power of a user equipment located at the edge of a cell. In such a manner, the impact of D2D in-band interference on cellular transmission could be further reduced.
  • the user equipment is configured to be only able to use the resources in the restricted D2D resource zone in the first zone for D2D communication when the user equipment locates at the center of the cell, while the user equipment is configured to be able to use the resources in the unrestricted D2D resource zone in the second zone for D2D communication or to use the resources in the first zone and in the second zone for D2D communication when the user equipment locates at the edge of the cell.
  • the user equipments could decide by themselves that to which group they belong and such a grouping manner is only illustrative but not limitative. Those skilled in the art should understand that in order to control more accurately the user equipments could be divided into more than two groups. After such a grouping it is optimized that different resource zones are used by different groups such that the impact of D2D in-band interference on cellular transmission is reduced.
  • the user equipment is configured to be only able to use the unrestricted D2D resource zone in the second zone for D2D communication when the user equipment locates at the edge of the cell.
  • the second group is configured to be able to use the resource in the unrestricted D2D resource zone in the second zone for D2D communication and thus the receipt of the PUCCH in the corresponding base station is minimally influenced by the D2D user equipment in the second group.
  • the user equipment when the user equipment locates at the edge of the cell and the user equipment is configured to be able to use the resource in the restricted D2D resource zone and the resource in the unrestricted D2D resource zone in the first zone and in the second zone for D2D communication, the user equipment selects the resource in the restricted D2D resource zone in the first zone for D2D communication with a first probability and selects the resource in the unrestricted D2D resource zone in the second zone for D2D communication with a second probability.
  • the first probability is smaller than the second probability.
  • the first probability is associated with the number of resources in the first zone and the second probability is associated with the number of resources in the second zone.
  • the inventor of the present invention utilizes the base station to divide the D2D resource pool into a resource pool including a first zone and a second zone, wherein the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone.
  • a configuration could divide the D2D resource pool to configure differently for different user equipments or make the user equipment to autonomously select different resources, so as to reduce impact of D2D in-band interference on cellular transmission effectively.

Abstract

The invention relates to a method, implemented in a base station of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission, the method comprises the base station configuring the D2D resource pool as a resource pool including a first zone and a second zone, wherein the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone. Furthermore, the present invention relates to a method, implemented in a user equipment of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission, the method comprises the user equipment determining first location status information associated with the user equipment based on the signal quality of a signal received from the base station communicated therewith; and the user equipment performing corresponding D2D resource selection based on the first location status information. The method according to the present invention could reduce impact of D2D in-band interference on cellular transmission effectively by dividing the D2D resource pool into a first zone and a second zone and further dividing the user equipment into several groups.

Description

Method of reducing Impact of D2D In-Band Interference on Cellular Transmission
Field of the invention
The present invention relates to the technology field of wireless communication, and particularly to a method of reducing impact of D2D in-band interference on cellular transmission in base station or user equipment. Background of the invention
In LTE D2D study, it was decided that the D2D signals occupy part of uplink cellular resources (i.e., uplink carriers for FDD and uplink subframes for TDD), as shown in Figure 2 for the case of FDD. In particular, the D2D signals will occupy some periodical uplink subframes. In order to support the normal downlink cellular transmissions, the uplink cellular control signals (i.e., PUCCH) still have to be transmitted. That is to say in the D2D subframes the cellular PUCCH signals have to be multiplexed with D2D signals through FDM, as shown in Figure 2. On the other hand, according to the in-band emission interference modeling as described in 3 GPP TR38.843 V12.0.1 , "Study on LTE Device to Device Proximity Services - radio aspects", the cellular PUCCH signals suffer from the in-band interference from the D2D signals. Figure 1 shows an example of in-band emission interference model.
Since the uplink PUCCH signals (e.g., ACK/NACK, CQI feedback etc. depending on the PUCCH format) play an important role in supporting the downlink data transmission, the in-band emission interference from D2D signals to the cellular control signals has to be solved. This invention aims to address this technical problem.
Figure 1 illustrates an example of in-band interference, based on the modeling method described in 3 GPP TR38.843 V12.0.1 , "Study on LTE Device to Device Proximity Services - radio aspects" with updated parameters {W,X,Y,Z}={ 3,6,3,3 } .
In the previous meetings of RANI (before RAN1-77), there wasn't any discussion on the impact of the in-band emission interference of D2D signals on the cellular signals. According to the schedule, this technical issue will be an important topic for the upcoming RANI -77 meeting.
Up to now, the best existing solution of this problem is through usage of power control for the D2D signal, which has been proposed by the inventor in a previous Chinese patent with the patent number 201410041266.0 entitled "a power control scheme for D2D transmission".
The solution in the above mentioned patent works well in controlling the in-band emission interference to uplink cellular signals. However, it has some disadvantages. The main disadvantage is that by using power control, the D2D signal transmission powers are not uniform for different D2D users (the closer to base station, the lower the D2D signal transmission power is), thus the D2D transmission range is not uniform. This is not a desirable property for D2D transmissions. Summary of the invention
Based on the prior art described in the part background of the invention and the technical understanding of the existing technical problem, the present invention proposes a method, implemented in a base station of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission, the method comprises:
- the base station configuring the D2D resource pool as a resource pool including a first zone and a second zone, wherein the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone.
The inventor of the present invention utilizes the base station to divide the D2D resource pool into a resource pool including a first zone and a second zone, wherein the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone. Such a configuration could divide the D2D resource pool to be configured differently for different user equipments or make the user equipments to autonomously select different resources, so as to reduce impact of D2D in-band interference on cellular transmission effectively.
In one embodiment of the present invention, the number of resource blocks in the first zone is smaller than the number of resource blocks in the second zone, or the number of subframes in the first zone is smaller than the number of subframes in the second zone.
In such a manner the size of the first zone and the second zone can be configured to satisfy the requirement of different application scenarios, so as to reduce impact of D2D in-band interference on cellular transmission while the normal communication requirement is not influenced at the same time.
In one embodiment of the present invention, the method further comprises:
- dividing the D2D user equipments into at least two groups including a first group and a second group according to a predetermined rule; and
- the first group being configured to be only able to use the resources in the restricted D2D resource zone in the first zone for D2D communication while the second group being configured to be able to use the resources in the unrestricted D2D resource zone in the second zone for D2D communication or to use the resources in the first zone and in the second zone for D2D communication.
In such an embodiment, the user equipments are divided into different groups by the base station. However, the embodiment is illustrative but not limitative. Those skilled in the art should understand that the grouping manner could also be achieved in the way that the user equipments decide by themselves that to which group they belong and in order to control more accurately, the user equipments could be divided into more than two groups. After such a grouping it is optimized that different resource zones are used by different groups such that the impact of D2D in-band interference on cellular transmission is reduced.
In one embodiment of the present invention, the second group is configured to be only able to use the unrestricted D2D resource zone in the second zone for D2D communication. In such a manner, the second group is configured to be able to use the resource in the unrestricted D2D resource zone in the second zone for D2D communication and thus the receipt of the PUCCH in the corresponding base station is minimally influenced by the D2D user equipment in the second group.
In one embodiment of the present invention, the predetermined rule includes:
the base station dividing the user equipments connected therewith into at least two groups based on the strength of the signal sent from a user equipment connected therewith to the base station; or
the base station dividing the user equipments connected therewith into at least two groups based on the interference degree of the base station caused by the user equipments connected therewith.
Those skilled in the art should understand the two manners mentioned above are only illustrative but not limitative, other grouping manners are also possible. The designs which could achieve the main idea of the present invention fall into the protection scope of the present invention.
In one embodiment of the present invention, the first group is the user equipments set in which the strength of signal received from the base station exceeds a first threshold and the second group is the user equipments set in which the strength of signal received from the base station does not exceed a first threshold.
In such a manner, the corresponding user equipments could be advantageously and fast divided into groups.
Furthermore, a second aspect of the present invention provides a method, implemented in a user equipment of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission, the method comprising:
- the user equipment determining first location status information associated with the user equipment based on the signal quality of a signal received from the base station communicated therewith;
- the user equipment performing corresponding D2D resource selection based on the first location status information.
In the technical solution of the second aspect of the present invention, the user equipment could determine first location status information associated with the user equipment based on the signal quality of a signal received from the base station communicated therewith, and then the user equipment could select corresponding D2D resource based on the first location status information. In such a manner, the user equipment could select the D2D resource based on the first location status information orderly rather than that the D2D resource is not controlled to be chosen and only selected unorderly in the prior art.
In one embodiment of the present invention, the user equipment further receives configuration information of the resource pool from the base station, and wherein the configuration information of the resource pool includes resource configuration information indicating the first zone and the second zone, and the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone.
In such a manner, the user equipment could be informed how the D2D resource pool is allocated by the corresponding base station and the user equipment according to the present invention could select the D2D resource based on the allocation manner so as to reduce impact of D2D in-band interference on cellular transmission.
In one embodiment of the present invention, the first location status information includes location status indication information which at least includes a first status and a second status, and wherein the first status indicates that the user equipment locates at the center of a cell and the second status indicates that the user equipment locates at the edge of a cell. In such a manner, a grouping manner is illustrated to facilitate the succeed D2D resource selection.
In one embodiment of the present invention, the transmitting power of the user equipment located at the center of a cell is the same as that of the user equipment located at the edge of a cell, or the transmitting power of the user equipment located at the center of a cell is smaller than that of the user equipment located at the edge of a cell.
Those skilled in the art should understand that the transmitting power of a user equipment located at the center of a cell and the transmitting power of a user equipment located at the edge of a cell could be the same or different. Of course, the same transmitting power could make sure that the D2D user equipments have substantially the same discovery range when neighbor discovery is performing and thus it is beneficial for neighbor discovery. However, the transmitting power of a user equipment located at the center of a cell and the transmitting power of a user equipment located at the edge of a cell could also be different, for example, the transmitting power of a user equipment located at the center of a cell is smaller than the transmitting power of a user equipment located at the edge of a cell. In such a manner, the impact of D2D in-band interference on cellular transmission could be further reduced.
In one embodiment of the present invention, the user equipment is configured to be only able to use the resources in the restricted D2D resource zone in the first zone for D2D communication when the user equipment locates at the center of the cell, while the user equipment is configured to be able to use the resources in the unrestricted D2D resource zone in the second zone for D2D communication or to use the resources in the first zone and in the second zone for D2D communication when the user equipment locates at the edge of the cell. In such an embodiment, the user equipments could decide by themselves that to which group they belong and such a grouping manner is only illustrative but not limitative. Those skilled in the art should understand that in order to control more accurately the user equipments could be divided into more than two groups. After such a grouping it is optimized that different resource zones are used by different groups such that the impact of D2D in-band interference on cellular transmission is reduced.
In one embodiment of the present invention, the user equipment is configured to be only able to use the unrestricted D2D resource zone in the second zone for D2D communication when the user equipment locates at the edge of the cell. In such a manner, the second group is configured to be able to use the resource in the unrestricted D2D resource zone in the second zone for D2D communication and thus the receipt of the PUCCH in the corresponding base station is minimally influenced by the D2D user equipment in the second group.
In one embodiment of the present invention, when the user equipment locates at the edge of the cell and the user equipment is configured to be able to use the resource in the restricted D2D resource zone and the resource in the unrestricted D2D resource zone in the first zone and in the second zone for D2D communication, the user equipment selects the resource in the restricted D2D resource zone in the first zone for D2D communication with a first probability and selects the resource in the unrestricted D2D resource zone in the second zone for D2D communication with a second probability. In one embodiment of the present invention, the first probability is smaller than the second probability. In one embodiment of the present invention, the first probability is associated with the number of resources in the first zone and the second probability is associated with the number of resources in the second zone.
The inventor of the present invention utilizes the base station to divide the D2D resource pool into a resource pool including a first zone and a second zone, wherein the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone. Such a configuration could divide the D2D resource pool to configure differently for different user equipments or make the user equipment to autonomously select different resources, so as to reduce impact of D2D in-band interference on cellular transmission effectively.
Brief description of drawings
Other features, objects and advantages of the invention will become more apparent upon review of the following detailed description of non-limiting embodiments taken with reference to the drawings in which:
Fig. l illustrates a schematic diagram 100 of interference generated due to signal power leakage in the prior art;
Fig.2 illustrates a schematic diagram 200 of D2D resource pool configuration in the prior art;
Fig.3 illustrates a schematic diagram 300 of D2D resource pool configuration according to the present invention;
Fig.4 illustrates a schematic diagram 400 of a particular embodiment of the D2D resource pool configuration in the present invention;
Fig.5 illustrates a flow chart 500 of a method, implemented in a base station of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission; and
Fig.6 illustrates a flow chart 600 of a method, implemented in a user equipment of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission.
Identical or similar devices (modules) or steps will be denoted by identical or similar reference numerals throughout the drawings.
Detailed description of embodiments
The above described particular description of preferred embodiments will be given with reference to the drawings constituting a part of the invention. The drawings exemplarily illustrate particular embodiments, in which the invention can be practiced. The exemplary embodiments are not intended to exhaust all the embodiments of the invention. As can be appreciated, other embodiments can be possible or structural or logical modifications can be made without departing from the scope of the invention. Thus the following detailed description is not intended to be limiting, and the scope of the invention will be defined as in the appended claims.
Fig. l illustrates a schematic diagram 100 of interference generated due to signal power leakage in the prior art. As shown in Fig. l , while the useful signal 1 is transmitted, carrier leakage will occur as denoted by the numeral 2 and thus other cellular communication is influenced. On the other hand, Fig.2 illustrates a schematic diagram 200 of D2D resource pool configuration in the prior art. As shown in Fig.2, as an important signal in the control channel the PUCCH of the cellular network must be transmitted on the uplink grant, and thus the PUCCH of the cellular network and the D2D uplink frame must be frequency multiplexed transmitted. Due to the existence of the carrier leakage as shown in Fig. l , such a configuration must cause that the interference to the receipt of the PUCCH must be uncontrollable.
This invention proposes a scheme to address the in-band interference of D2D signal to cellular signals to a large extent. The basic ideas of the invention are as follows.
If the D2D discovery transmissions use constant (and relatively large, e.g., 23dBm) transmission power, the eNB will suffer from severe in-band interference in decoding the uplink signals (e.g., PUCCH), as mentioned above. If we further consider more details of the in-band interference from D2D signals to PUCCH receiving, we can know that the major interferers of such interference are those D2D UEs that are near eNB. Motivated by this, we can arrange a special region (in time) among the configured D2D discovery subframes such that the cell center D2D users can only occupy the discovery resource within the special region, while the other D2D users can occupy any resource of the configured resource pool, or alternatively, the other D2D users preferably occupy the discovery resource outside the special region to reduce collisions with the cell center D2D UEs. Here, the special resource region is named as a restricted D2D resource zone. Fig.3 illustrates a schematic diagram 200 of D2D resource pool configuration according to the present invention. As shown in Fig.3, the inventor of the present invention utilizes the base station to divide the D2D resource pool into a resource pool including a first zone and a second zone, wherein the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone. Such a configuration could divide the D2D resource pool to configure differently for different user equipments or make the user equipment to autonomously select different resources, so as to reduce impact of D2D in-band interference on cellular transmission effectively.
Fig.3 is only illustrative and the size of each zone is not configured. Fig.4 illustrates a schematic diagram 400 of a particular embodiment of the D2D resource pool configuration in the present invention. Assume that the D2D resource pool is configured, by the base station, as a periodic successive uplink subframe and it has the following size, namely 44 PRB in frequency domain and 32 subframes in time domain, as shown in Fig.4. Those skilled in the art should understand that these parameters are only illustrative but not limitative. In the resource configuration as shown in Fig.4, in order to reduce the in-band interference of D2D signal to the receipt of PUCCH, the present invention proposes to configure a restricted zone in the D2D resource pool. The size of this restricted zone should be very limited as shown in Fig. 4.
Under the resource pool configuration shown in Fig.3, Fig.5 and Fig.6 illustrate flow charts 500, 600 of a method, implemented in a base station or a user equipment of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission.
Fig.5 illustrates a flow chart 500 of a method, implemented in a base station of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission. As shown in Fig.5, the method comprises at least the following steps: in the method step 510, the base station configures the D2D resource pool as a resource pool including a first zone and a second zone, wherein the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone.
Advantageously, in one embodiment of the present invention, the number of resource blocks in the first zone is smaller than that in the second zone, or the number of subframes in the first zone is smaller than that in the second zone.
In such a manner the size of the first zone and the second zone can be configured to satisfy the requirement of different application scenarios, so as to reduce impact of D2D in-band interference on cellular transmission while the normal communication requirement is not influenced at the same time.
Advantageously, in one embodiment of the present invention, the method further comprises:
- dividing the D2D user equipments into at least two groups including a first group and a second group according to a predetermined rule; and
- the first group being configured to be only able to use the resources in the restricted D2D resource zone in the first zone for D2D communication while the second group being configured to be able to use the resources in the unrestricted D2D resource zone in the second zone for D2D communication or to use the resources in the first zone and in the second zone for D2D communication.
Advantageously, in such an embodiment, the user equipments are divided into different groups by the base station. However, the embodiment is illustrative but not limitative. Those skilled in the art should understand that the grouping manner could also be achieved in the way that the user equipments decide by themselves that to which group they belong and in order to control more accurately the user equipments could be divided into more than two groups. After such a grouping it is optimized that different resource zones are used by different groups such that the impact of D2D in-band interference on cellular transmission is reduced.
Advantageously, in one embodiment of the present invention, the second group is configured to be only able to use the unrestricted D2D resource zone in the second zone for D2D communication. In such a manner, the second group is configured to be able to use the resource in the unrestricted D2D resource zone in the second zone for D2D communication and thus the receipt of the PUCCH in the corresponding base station is minimally influenced by the D2D user equipment in the second group.
Advantageously, in one embodiment of the present invention, the predetermined rule includes:
the base station dividing the user equipments connected therewith into at least two groups based on the strength of the signal sent from a user equipment connected therewith to the base station; or
the base station dividing the user equipments connected therewith into at least two groups based on the interference degree of the base station caused by the user equipments connected therewith.
Those skilled in the art should understand the two manners mentioned above are only illustrative but not limitative, other grouping manners are also possible. The designs which could achieve the main idea of the present invention fall into the scope of the present invention.
In one embodiment of the present invention, the first group is the user equipments set in which the strength of signal received from the base station exceeds a first threshold and the second group is the user equipments set in which the strength of signal received from the base station does not exceed a first threshold.
In such a manner, the corresponding user equipments could be advantageously and fast divided into groups. Fig.6 illustrates a flow chart 600 of a method, implemented in a user equipment of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission. As shown in Fig.6, the method according to the present invention comprises at least the following two steps, namely in the method step 610, the user equipment determines first location status information associated with the user equipment based on the signal quality of a signal received from the base station communicated therewith; and then in the method step 620, the user equipment performing corresponding D2D resource selection based on the first location status information.
In the technical solution according to the present invention as shown in Fig.6, the user equipment could determine first location status information associated with the user equipment based on the signal quality of a signal received from the base station communicated therewith, and then the user equipment could select corresponding D2D resource based on the first location status information. In such a manner, the user equipment could select the D2D resource based on the first location status information orderly rather than that the D2D resource is not controlled to be chosen and only selected unorderly.
Advantageously, in one embodiment of the present invention, the user equipment further receives configuration information of the resource pool from the base station, and wherein the configuration information of the resource pool includes resource configuration information indicating the first zone and the second zone, and the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone.
In such a manner, the user equipment could be informed how the D2D resource pool is allocated by the corresponding base station and the user equipment according to the present invention could select the D2D resource based on the allocation manner so as to reduce impact of D2D in-band interference on cellular transmission.
Advantageously, in one embodiment of the present invention, the first location status information includes location status indication information which at least includes a first status and a second status, and wherein the first status indicates that the user equipment locates at the center of a cell and the second status indicates that the user equipment locates at the edge of a cell. In such a manner, a grouping manner is illustrated to facilitate the succeed D2D resource selection.
Advantageously, in one embodiment of the present invention, the transmitting power of the user equipment located at the center of a cell is the same as that of the user equipment located at the edge of a cell, or the transmitting power of the user equipment located at the center of a cell is smaller than that of the user equipment located at the edge of a cell.
Those skilled in the art should understand that the transmitting power of a user equipment located at the center of a cell and the transmitting power of a user equipment located at the edge of a cell could be the same or different. Of course, the same transmitting power could make sure that the D2D user equipments have substantially the same discovery range when neighbor discovery is performing and thus it is beneficial for neighbor discovery. However, the transmitting power of a user equipment located at the center of a cell and the transmitting power of a user equipment located at the edge of a cell could also be different, for example, the transmitting power of a user equipment located at the center of a cell is smaller than the transmitting power of a user equipment located at the edge of a cell. In such a manner, the impact of D2D in-band interference on cellular transmission could be further reduced.
Advantageously, in one embodiment of the present invention, the user equipment is configured to be only able to use the resources in the restricted D2D resource zone in the first zone for D2D communication when the user equipment locates at the center of the cell, while the user equipment is configured to be able to use the resources in the unrestricted D2D resource zone in the second zone for D2D communication or to use the resources in the first zone and in the second zone for D2D communication when the user equipment locates at the edge of the cell. In such an embodiment, the user equipments could decide by themselves that to which group they belong and such a grouping manner is only illustrative but not limitative. Those skilled in the art should understand that in order to control more accurately the user equipments could be divided into more than two groups. After such a grouping it is optimized that different resource zones are used by different groups such that the impact of D2D in-band interference on cellular transmission is reduced.
Advantageously, in one embodiment of the present invention, the user equipment is configured to be only able to use the unrestricted D2D resource zone in the second zone for D2D communication when the user equipment locates at the edge of the cell. In such a manner, the second group is configured to be able to use the resource in the unrestricted D2D resource zone in the second zone for D2D communication and thus the receipt of the PUCCH in the corresponding base station is minimally influenced by the D2D user equipment in the second group.
Advantageously, in one embodiment of the present invention, when the user equipment locates at the edge of the cell and the user equipment is configured to be able to use the resource in the restricted D2D resource zone and the resource in the unrestricted D2D resource zone in the first zone and in the second zone for D2D communication, the user equipment selects the resource in the restricted D2D resource zone in the first zone for D2D communication with a first probability and selects the resource in the unrestricted D2D resource zone in the second zone for D2D communication with a second probability. In one embodiment of the present invention, the first probability is smaller than the second probability. In one embodiment of the present invention, the first probability is associated with the number of resources in the first zone and the second probability is associated with the number of resources in the second zone.
The inventor of the present invention utilizes the base station to divide the D2D resource pool into a resource pool including a first zone and a second zone, wherein the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone. Such a configuration could divide the D2D resource pool to configure differently for different user equipments or make the user equipment to autonomously select different resources, so as to reduce impact of D2D in-band interference on cellular transmission effectively.
Those skilled in the art shall appreciate that the invention apparently will not be limited to the foregoing exemplary embodiments and can be embodied in other specific forms without departing from the spirit or essence of the invention. Accordingly the embodiments shall be construed anyway to be exemplary and non-limiting. Moreover apparently the term "comprising" will not preclude another element(s) or step(s), and the term "a" or "an" will not preclude plural. A plurality of elements stated in an apparatus claim can alternatively be embodied as a single element. The terms "first", "second", etc., are intended to designate a name but not to suggest any specific order.

Claims

1. A method, implemented in a base station of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission, the method comprising:
- the base station configuring the D2D resource pool as a resource pool including a first zone and a second zone, wherein the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone.
2. The method according to claim 1 , wherein the number of resource blocks in the first zone is smaller than the number of resource blocks in the second zone, or the number of subframes in the first zone is smaller than the number of subframes in the second zone.
3. The method according to claim 1 or 2, wherein the method further comprises:
- dividing the D2D user equipments into at least two groups including a first group and a second group according to a predetermined rule; and
- the first group being configured to be only able to use the resources in the restricted D2D resource zone in the first zone for D2D communication while the second group being configured to be able to use the resources in the unrestricted D2D resource zone in the second zone for D2D communication or to use the resources in the first zone and in the second zone for D2D communication.
4. The method according to claim 3, wherein the second group is configured to be able to use the resources in the unrestricted D2D resource zone in the second zone for D2D communication.
5. The method according to claim 1 , wherein the predetermined rule includes:
the base station dividing the user equipments connected therewith into at least two groups based on the strength of the signal sent from a user equipment connected therewith to the base station; or the base station dividing the user equipments connected therewith into at least two groups based on the interference degree of the base station caused by the user equipment connected therewith.
6. The method according to claim 1, wherein the first group is the user equipments set in which the strength of signal received from the base station exceeds a first threshold and the second group is the user equipments set in which the strength of signal received from the base station does not exceed the first threshold.
7. A method, implemented in a user equipment of a wireless communication system, of reducing impact of D2D in-band interference on cellular transmission, the method comprising:
- the user equipment determining first location status information associated with the user equipment based on the signal quality of a signal received from the base station communicated therewith;
- the user equipment performing corresponding D2D resource selection based on the first location status information.
8. The method according to claim 7, wherein the user equipment further receives configuration information of the resource pool from the base station, and wherein the configuration information of the resource pool includes resource configuration information indicating a first zone and a second zone, and the first zone is a restricted D2D resource zone and the second zone is an unrestricted D2D resource zone.
9. The method according to claim 8, wherein the first location status information includes location status indication information which at least includes a first status and a second status, and wherein the first status indicates that the user equipment locates at the center of a cell and the second status indicates that the user equipment locates at the edge of a cell.
10. The method according to claim 9, wherein the transmitting power of the user equipment located at the center of a cell is the same as that of the user equipment located at the edge of a cell, or the transmitting power of the user equipment located at the center of a cell is smaller than that of the user equipment located at the edge of a cell.
11. The method according to claim 9, wherein the user equipment is configured to be only able to use the resources in the restricted D2D resource zone in the first zone for D2D communication when the user equipment locates at the center of the cell, while the user equipment is configured to be able to use the resources in the unrestricted D2D resource zone in the second zone for D2D communication or to use the resources in the first zone and in the second zone for D2D communication when the user equipment locates at the edge of the cell.
12. The method according to claim 11 , wherein the user equipment is configured to be only able to use the unrestricted D2D resource zone in the second zone for D2D communication when the user equipment locates at the edge of the cell.
13. The method according to claim 11 , wherein when the user equipment locates at the edge of the cell and the user equipment is configured to be able to use the resource in the restricted D2D resource zone and the resource in the unrestricted D2D resource zone in the first zone and in the second zone for D2D communication, the user equipment selects the resource in the restricted D2D resource zone in the first zone for D2D communication with a first probability and selects the resource in the unrestricted D2D resource zone in the second zone for D2D communication with a second probability.
14. The method according to claim 12, wherein the first probability is smaller than the second probability.
15. The method according to claim 13, wherein the first probability is associated with the number of resources in the first zone and the second probability is associated with the number of resources in the second zone.
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