CN106658740B - Method and system for improving LAA uplink transmission performance - Google Patents
Method and system for improving LAA uplink transmission performance Download PDFInfo
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- CN106658740B CN106658740B CN201510726698.XA CN201510726698A CN106658740B CN 106658740 B CN106658740 B CN 106658740B CN 201510726698 A CN201510726698 A CN 201510726698A CN 106658740 B CN106658740 B CN 106658740B
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- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The invention discloses a method and a system for improving LAA uplink transmission performance. The method comprises the following steps: when the user terminal carries out uplink transmission, the user terminal sends an uplink scheduling request and a buffer status report to the base station; the base station selects corresponding unauthorized carriers according to the cache state report of the user terminal, the current load conditions of all carriers and the unauthorized carrier interference conditions, and sends an uplink scheduling authorization (UL grant) message to the user terminal; and after receiving the UL grant message, the user terminal carries out idle channel evaluation on the unauthorized carrier, if the unauthorized carrier channel is idle and available, the user terminal calculates the PUSCH (physical uplink shared channel) transmitting power of the indicated unauthorized carrier by using the power adjustment information, and carries out uplink transmission on the uplink transmission resource of the unauthorized carrier indicated by the UL grant by using the adjusted PUSCH transmitting power. The invention can improve the reliability and efficiency of LAA uplink transmission.
Description
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a method and system for improving LAA uplink transmission performance.
Background
The rapid development of the mobile internet and the wide popularization of the intelligent terminal, and the sudden increase of data flow enables the pressure of the existing network capacity to be doubled. In order to solve the problem of mobile network capacity, on one hand, the utilization rate of the existing spectrum needs to be improved through technical innovation, and on the other hand, more spectrum resources need to be sought.
Currently, the Licensed Assisted Access (LAA) technology, which is intensively studied in Release 13 by 3GPP, is one of the key technologies for solving the problem of capacity expansion of the LTE network by using the unlicensed spectrum. The LTE can be deployed in the unlicensed frequency band in a carrier aggregation mode with the assistance of the licensed frequency spectrum, and a large amount of available unlicensed frequency spectrum resources in the 5GHz frequency band are fully utilized.
LAA is different from Carrier Aggregation (CA), in that CA is an authorized frequency band, and uplink and downlink scheduling of multiple carriers is performed by a base station without considering Carrier availability. LAA uses unlicensed spectrum for uplink and downlink transmission, and in order to coexist with other systems (Wi-Fi, radar, other LAA systems, etc.), it is necessary to detect the channel state before transmission.
Some countries and regions specify the need for Listen Before Talk (LBT) operations prior to data transmission, i.e., Clear Channel Assessment (CCA) to determine the Channel availability status prior to data transmission, to avoid interference with other systems.
RAN1 is evaluating and discussing LAA deployment scenarios and various LBT solutions, including LBT for base stations and terminals, etc. The deployment scenario of LAA may be four cases, and there may be one or more unlicensed carriers in each scenario. The scene 1 is a macro-micro two-layer coverage carrier aggregation scene, wherein a macro station is covered by an authorized carrier (F1), and a micro station is covered by an unauthorized carrier (F3); scene 2 is a carrier aggregation scene of pico-two layer coverage, wherein one layer of micro stations is covered by authorized carriers (F2), and the other layer of micro stations is covered by unauthorized carriers (F3); scene 3 is a macro-micro three-layer coverage scene, wherein one layer of macro station is covered by an authorized carrier (F1), one layer of micro station is covered by an authorized carrier (F1), one layer of micro station is covered by an unauthorized carrier (F3), and the micro stations F1 and F3 perform carrier aggregation; scene 4 is a macro-micro three-layer coverage scene, wherein a macro station is covered by an authorized carrier (F1), and a micro station in one layer is covered by an authorized carrier (F2); one layer of the micro stations is covered by an unauthorized carrier (F3), and the micro stations F2 and F3 perform carrier aggregation.
When the unlicensed frequency band is used for uplink transmission and uplink carrier aggregation is performed with the licensed frequency band, a situation that a user is scheduled to perform uplink transmission simultaneously in a plurality of carriers of a serving cell exists. Due to the burstiness and uncertainty of the interference of the unlicensed frequency band, the uplink channel which a user may not compete for the unlicensed carrier at the uplink transmission time cannot be transmitted, which causes the problems of the waste of the uplink transmission power of the terminal and the reduction of the uplink transmission efficiency.
Disclosure of Invention
The technical problem to be solved by the invention is how to improve the performance of LAA uplink transmission.
According to an aspect of the present invention, a method for improving LAA uplink transmission performance is provided, including:
when the user terminal carries out uplink transmission, the user terminal sends an uplink scheduling request and a buffer status report to the base station;
the base station selects corresponding unauthorized carriers according to the buffer state report of the user terminal, the current load conditions of all carriers and the unauthorized carrier interference conditions, and sends an uplink scheduling authorization (UL grant) message to the user terminal, wherein the UL grant message comprises unauthorized carrier indication information, a modulation coding mode, uplink transmission resource allocation information and power adjustment information used by uplink transmission of the user terminal;
and after receiving the UL grant message, the user terminal carries out idle channel evaluation on the unauthorized carrier, if the unauthorized carrier channel is idle and available, the user terminal calculates the PUSCH (physical uplink shared channel) transmitting power of the indicated unauthorized carrier by using the power adjustment information, and carries out uplink transmission on the uplink transmission resource of the unauthorized carrier indicated by the UL grant by using the adjusted PUSCH transmitting power.
In one embodiment, the step of calculating the PUSCH transmit power for the indicated unlicensed carrier using the power adjustment information is preceded by:
and the user terminal calculates the sum of the PUSCH transmitting power of each indicated uplink scheduling carrier, compares the sum with the maximum transmitting power of the user terminal at the current moment, and recalculates the PUSCH transmitting power of the unauthorized carrier by using the power adjustment information if the transmitting power is left.
In one embodiment, the power adjustment information includes a transmit power control, TPC, adjustment value for the unlicensed carrier.
In one embodiment, the step of the user terminal calculating the PUSCH transmission power of the indicated unlicensed carrier by using the power adjustment information comprises:
calculating the PUSCH transmitting power P of the unauthorized carrier wave by using a first formula according to the indication information in the UL grant messagePUSCH,c(i) Wherein the first formula is:
where c denotes the indicated unlicensed carrier, i denotes the ith subframe,
representing the maximum transmit power of the user terminal on the unlicensed carrier c sub-frame i,
denotes the transmit power, M, of the PUCCH channel on subframe iPUSCH,c(i) Indicating the transmission bandwidth, P, of the PUSCH channel on the unlicensed carrier c sub-frame iO_PUSCH,c(j) Indicating a reference value for the transmit power of each physical resource block on the PUSCH channel on the unlicensed carrier c, αc(j) Represents the amount of path loss compensation, PL, for the unlicensed carrier ccRepresenting the downlink path loss, ΔTF,c(i) Indicating the power offset, f, of the unlicensed carrier c determined by the modulation and coding scheme and the data typec(i) The power control adjustment value of the unauthorized carrier c is shown, if the power value is adjusted in an accumulative value mode, the power control adjustment value is used for indicating the unauthorized carrier c
fc(i)＝fc(i-1)+δPUSCH,c(i-KPUSCH)+θboosting,c(i)
Wherein, deltaPUSCH,c(i-KPUSCH) For sub-frames i-K in UL grant messagePUSCHBy a specified parameter ofboosting,c(i) The value is adjusted for the TPC for the unlicensed carrier c.
In one embodiment, if the power gain value is adjusted in an absolute value mode, the PUSCH transmission power P of the unlicensed carrier is calculated by using a first formulaPUSCH,c(i) Wherein f isc(i) Comprises the following steps:
fc(i)＝δPUSCH,c(i-KPUSCH)+θboosting,c(i)
wherein deltaPUSCH,c(i-KPUSCH) For sub-frames i-K in UL grant messagePUSCHBy a specified parameter ofboosting,c(i) The value is adjusted for the TPC for the unlicensed carrier c.
According to another aspect of the present invention, a system for improving LAA uplink transmission performance is further provided, including:
the user terminal is used for sending an uplink scheduling request and a buffer status report to the base station when uplink transmission is carried out; the system is also used for carrying out idle channel evaluation on the unauthorized carrier after receiving the UL grant message, if the unauthorized carrier is available in idle, calculating the Physical Uplink Shared Channel (PUSCH) transmitting power of the indicated unauthorized carrier by using the power adjustment information, and carrying out uplink transmission on the uplink transmission resource of the unauthorized carrier indicated by the UL grant by using the adjusted PUSCH transmitting power;
and the base station is used for selecting corresponding unauthorized carriers according to the buffer state report of the user terminal, the current load conditions of all carriers and the unauthorized carrier interference conditions, and sending an uplink scheduling authorization (UL grant) message to the user terminal, wherein the UL grant message comprises unauthorized carrier indication information, a modulation coding mode, uplink transmission resource allocation information and power adjustment information used by uplink transmission of the user terminal.
In one embodiment, the user terminal is configured to calculate a sum of PUSCH transmission powers of each indicated uplink scheduling unlicensed carrier, compare the sum with a maximum transmission power of the user terminal at a current time, and recalculate the transmission power of the unlicensed carrier PUSCH by using the power adjustment information if the transmission power remains.
In one embodiment, the power adjustment information includes a transmit power control, TPC, adjustment value for the unlicensed carrier.
In one embodiment, the user terminal is configured to calculate the PUSCH transmission power P of the unlicensed carrier according to the indication information in the UL grant message by using the first formulaPUSCH,c(i) Wherein the first formula is:
where c denotes the indicated unlicensed carrier, i denotes the ith subframe,
representing the maximum transmit power of the user terminal on the unlicensed carrier c sub-frame i,
denotes the transmit power, M, of the PUCCH channel on subframe iPUSCH,c(i) Indicating the transmission bandwidth, P, of the PUSCH channel on the unlicensed carrier c sub-frame iO_PUSCH,c(j) Indicating a reference value for the transmit power of each physical resource block on the PUSCH channel on the unlicensed carrier c, αc(j) Represents the amount of path loss compensation, PL, for the unlicensed carrier ccRepresenting the downlink path loss, ΔTF,c(i) Indicating the power offset, f, of the unlicensed carrier c determined by the modulation and coding scheme and the data typec(i) The power control adjustment value of the unauthorized carrier c is shown, if the power value is adjusted in an accumulative value mode, the power control adjustment value is used for indicating the unauthorized carrier c
fc(i)＝fc(i-1)+δPUSCH,c(i-KPUSCH)+θboosting,c(i)
Wherein, deltaPUSCH,c(i-KPUSCH) For sub-frames i-K in UL grant messagePUSCHBy a specified parameter ofboosting,c(i) The value is adjusted for the TPC for the unlicensed carrier c.
In one embodiment, the user terminal is configured to calculate the PUSCH transmission power P of the unlicensed carrier using the first formula if the power gain value is adjusted in an absolute value mannerPUSCH,c(i) Wherein f isc(i) Comprises the following steps:
fc(i)＝δPUSCH,c(i-KPUSCH)+θboosting,c(i)
wherein deltaPUSCH,c(i-KPUSCH) For sub-frames i-K in UL grant messagePUSCHBy a specified parameter ofboosting,c(i) The value is adjusted for the TPC for the unlicensed carrier c.
Compared with the prior art, the user terminal sends an uplink scheduling request and a buffer status report to the base station when performing uplink transmission; the base station selects corresponding unauthorized carriers according to the buffer state report of the user terminal, the current load conditions of all carriers and the unauthorized carrier interference conditions, and sends an uplink scheduling authorization (UL grant) message to the user terminal, wherein the UL grant message comprises unauthorized carrier indication information, a modulation coding mode, uplink transmission resource allocation information and power adjustment information used by uplink transmission of the user terminal; and after receiving the UL grant message, the user terminal carries out idle channel evaluation on the unauthorized carrier, if the unauthorized carrier channel is idle and available, the user terminal calculates the PUSCH (physical uplink shared channel) transmitting power of the indicated unauthorized carrier by using the power adjustment information, and carries out uplink transmission on the uplink transmission resource of the unauthorized carrier indicated by the UL grant by using the adjusted PUSCH transmitting power. That is, the power allocated to the unlicensed carrier but not actually used is reallocated, so that the idea of fully utilizing the burst available resources of the unlicensed frequency band to improve the reliability and efficiency of LAA uplink transmission is achieved. In addition, the invention has lower complexity in implementation, and can realize the increase of the reliability or the efficiency of the LAA uplink transmission only by small overhead.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
The invention will be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
fig. 1 is a flowchart illustrating a method for improving LAA uplink transmission performance according to an embodiment of the present invention.
Fig. 2 is a flowchart illustrating a method for improving LAA uplink transmission performance according to another embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a system for improving LAA uplink transmission performance according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
Fig. 1 is a flowchart illustrating a method for improving LAA uplink transmission performance according to an embodiment of the present invention. The method comprises the following steps:
in step 110, when performing uplink transmission, the user terminal sends an uplink scheduling request and a buffer status report to the base station.
When a user terminal has data to transmit, an uplink scheduling request is firstly used for requesting uplink resources to a base station, wherein the uplink scheduling request indicates whether uplink data needs to be transmitted or not, and does not indicate how much uplink data the terminal needs to transmit. After receiving the uplink scheduling request, the base station allocates uplink resources to the user terminal so that the user terminal can send a buffer status report. The user terminal sends a buffer status report on the designated resource to inform the base station of how much data needs to be sent in the uplink buffer, so that the base station can determine how much uplink resource is allocated to the user.
In step 120, the base station selects a corresponding unlicensed carrier according to the buffer status report of the user terminal, the current load conditions of all carriers, and the unlicensed carrier interference conditions, and sends an uplink scheduling grant UL grant message to the user terminal, where the UL grant message includes unlicensed carrier indication information, modulation and coding scheme, uplink transmission resource allocation information, and power adjustment information used for uplink transmission of the user terminal.
In step 130, after receiving the UL grant message, the ue performs idle channel assessment on the unlicensed carrier indicated by the message, and determines whether there is an unlicensed carrier available for channel idle, if not, then step 140 is performed, otherwise, step 150 is performed.
At step 140, no uplink data transmission is performed on the unlicensed carrier on which the channel is unavailable.
In step 150, the power adjustment information is used to calculate the PUSCH transmission power of the physical uplink shared channel of the unlicensed carrier available in the idle channel, and the adjusted PUSCH transmission power is used to perform uplink transmission on the uplink transmission resource of the unlicensed carrier indicated by the UL grant.
The step of calculating the PUSCH transmission power of the unlicensed carrier available for channel idle by using the power adjustment information comprises the following steps: and the user terminal calculates the sum of the uplink PUSCH transmitting power of all uplink carriers (including the authorized carrier and the unauthorized carrier) and compares the sum with the maximum transmitting power of the user terminal at the current moment, and if the transmitting power is left, the transmitting power of the PUSCH of the unauthorized carrier is recalculated by using the power adjustment information.
According to the invention, the UL grant message is improved, new information bits are introduced, and a new downlink control information format DCI format is formed and is used for the PUSCH scheduling of the UL grant message transmission of the service carrier under the LAA scene, so that the reliability and the throughput of uplink transmission are improved. The format of the new DCI format is shown in table 1:
TABLE 1
In this embodiment, when performing uplink transmission, the user terminal of the present invention sends an uplink scheduling request and a buffer status report to the base station; the base station selects corresponding unauthorized carriers according to the buffer state report of the user terminal, the current load conditions of all carriers and the interference conditions of the unauthorized carriers, and sends an uplink scheduling authorization (UL grant) message to the user terminal, wherein the UL grant message comprises unauthorized carrier indication information, a modulation coding mode, uplink transmission resource allocation information and power adjustment information used by uplink transmission of the user terminal; and after receiving the UL grant message, the user terminal carries out idle channel evaluation on the unauthorized carrier, if the unauthorized carrier channel is idle and available, the user terminal calculates the PUSCH (physical uplink shared channel) transmitting power of the indicated unauthorized carrier by using the power adjustment information, and carries out uplink transmission on the uplink transmission resource of the unauthorized carrier indicated by the UL grant by using the adjusted PUSCH transmitting power. Namely, a new DCI format is formed by improving the UL grant message and introducing new information bits, and is used for scheduling the transmission of the UL grant message by a service carrier PUSCH under an LAA scene so as to improve the reliability and the throughput of uplink transmission. In addition, the invention has lower complexity in implementation, and can realize the increase of the reliability or the efficiency of the LAA uplink transmission only by small overhead.
Fig. 2 is a flowchart illustrating a method for improving LAA uplink transmission performance according to another embodiment of the present invention. The method comprises the following steps:
in step 210, when performing uplink transmission, the user terminal sends an uplink scheduling request and a buffer status report to the base station.
In step 220, the base station selects a corresponding unlicensed carrier according to the buffer status report of the user terminal, the current load conditions of all carriers, and the unlicensed carrier interference conditions, and sends an uplink scheduling grant UL grant message to the user terminal, where the UL grant message includes unlicensed carrier indication information used for uplink transmission of the user terminal, a modulation and coding scheme, uplink transmission resource allocation information, and a TPC adjustment value for transmission power control of the unlicensed carrier.
In the method, the newly added TPC information bit is at least 1bit and is used for Power boosting range indication. The range of Power boosting performed by the user terminal cannot be too large, and the interference to the adjacent cells caused by the fact that the uplink Power deviates from the original distributed Power and is too high is avoided.
The relation between the new TPC bit information and the Power boosting range is defined by a protocol, an accumulated value and an absolute value can be simultaneously defined, the conversion between the adjustment modes is semi-static, specifically, the absolute value adjustment or the relative accumulated value adjustment is determined by a base station and is informed to a terminal through a special RRC signaling (Uplink Power Control determined: accumulation Enabled).
In step 230, the ue calculates the PUSCH transmit power P of the unlicensed carrier according to the indication information in the UL grant message by using the first formulaPUSCH,c(i) In that respect Wherein the first formula is:
wherein c represents the indicated unlicensed carrier; i represents the ith subframe;
the maximum transmitting power of the user terminal on the non-authorized carrier c subframe i is represented as a linear value;
represents the transmission power of the PUCCH channel on the subframe i; mPUSCH,c(i) Represents the transmission bandwidth of the PUSCH channel on the non-authorized carrier c subframe i, namely the PRB number; pO_PUSCH,c(j) The transmission power reference value of each physical resource block on the PUSCH on the unauthorized carrier c is shown, the transmission power reference value of each PRB of the PUSCH set by the high-level signaling comprises two parts of cell nominal power and specific UE nominal power, the high-level signaling informs that different j values represent different meanings, and P is PO_PUSCH,c(j) The values are also different, for example, j-0 indicates power control for semi-persistent scheduling, j-1 indicates power control for dynamic scheduling, j-2 indicates power control for message3, αc(j) Representing the path loss compensation of the unlicensed carrier c, indicated by a high-level signaling, different values of j, representing different meanings, αc(j) The value ranges are also different, and for the value range 0-1 of j, the value range is configured by higher layer signaling, for example αc(2)＝1；PLcRepresenting the downlink path loss; deltaTF,c(i) Indicating the power offset of the unauthorized carrier c determined by the modulation coding mode and the data type; f. ofc(i) The power control adjustment value of the unauthorized carrier c is shown, if the power value is adjusted in an accumulative value mode, the power control adjustment value is used for indicating the unauthorized carrier c
fc(i)＝fc(i-1)+δPUSCH,c(i-KPUSCH)+θboosting,c(i)
If the power increasing value is adjusted by adopting an absolute value mode, then
fc(i)＝δPUSCH,c(i-KPUSCH)+θboosting,c(i)
Wherein, deltaPUSCH,c(i-KPUSCH) For sub-frames i-K in UL grant messagePUSCHBy a specified parameter ofboosting,c(i) The value is adjusted for the TPC for the unlicensed carrier c.
In step 240, the ue performs uplink transmission on the uplink transmission resource of the unlicensed carrier indicated by the UL grant by using the adjusted PUSCH transmission power.
In this embodiment, the power is increased by adding a new TPC information bit in the UL grant message, the PUSCH transmission power of the carrier c is calculated according to the TPC information bit using the first formula, and uplink transmission is performed on the uplink transmission resource of the unlicensed carrier indicated by the UL grant according to the adjusted PUSCH transmission power, so that the reliability of uplink transmission can be improved.
Fig. 3 is a schematic structural diagram of a system for improving LAA uplink transmission performance according to an embodiment of the present invention. The system comprises a user terminal 310 and a base station 320, wherein:
the user terminal 310 is configured to send an uplink scheduling request and a buffer status report to the base station when performing uplink transmission; and the uplink transmission method is also used for carrying out idle channel evaluation on the unauthorized carrier indicated by the message after receiving the UL grant message, if the channel of the unauthorized carrier is idle and available, calculating the Physical Uplink Shared Channel (PUSCH) transmitting power of the indicated unauthorized carrier by using the power adjustment information, and carrying out uplink transmission on the uplink transmission resource of the unauthorized carrier indicated by the UL grant by using the adjusted PUSCH transmitting power.
When a user terminal has data to transmit, an uplink scheduling request is firstly used for requesting uplink resources to a base station, wherein the uplink scheduling request indicates whether uplink data needs to be transmitted or not, and does not indicate how much uplink data the terminal needs to transmit. After receiving the uplink scheduling request, the base station allocates uplink resources to the user terminal so that the user terminal can send a buffer status report. The user terminal sends a buffer status report on the designated resource to inform the base station of how much data needs to be sent in the uplink buffer, so that the base station can determine how much uplink resource is allocated to the user. And the user terminal also calculates the sum of the uplink PUSCH transmitting power of all uplink carriers (including authorized carriers and unauthorized carriers), compares the sum with the maximum transmitting power of the user terminal at the current moment, and recalculates the transmitting power of the PUSCH of the unauthorized carrier by using the power adjustment information if the transmitting power is left.
The base station 320 is configured to select a corresponding unlicensed carrier according to the buffer status report of the user terminal, the current load conditions of all carriers, and the unlicensed carrier interference conditions, and send an uplink scheduling grant UL grant message to the user terminal, where the UL grant message includes unlicensed carrier indication information, a modulation and coding scheme, uplink transmission resource allocation information, and power adjustment information used for uplink transmission of the user terminal.
According to the invention, the UL grant message is improved, new information bits are introduced, and a new downlink control information format DCI format is formed and is used for the PUSCH scheduling of the UL grant message transmission of the service carrier under the LAA scene, so that the reliability and the throughput of uplink transmission are improved. The format of the added DCI format is shown in table 1.
In this embodiment, when performing uplink transmission, the user terminal of the present invention sends an uplink scheduling request and a buffer status report to the base station; the base station selects corresponding unauthorized carriers according to the buffer state report of the user terminal, the current load conditions of all carriers and the interference conditions of the unauthorized carriers, and sends an uplink scheduling authorization (UL grant) message to the user terminal, wherein the UL grant message comprises unauthorized carrier indication information, a modulation coding mode, uplink transmission resource allocation information and power adjustment information used by uplink transmission of the user terminal; and after receiving the UL grant message, the user terminal carries out idle channel evaluation on the unauthorized carrier, if the unauthorized carrier channel is idle and available, the user terminal calculates the PUSCH (physical uplink shared channel) transmitting power of the indicated unauthorized carrier by using the power adjustment information, and carries out uplink transmission on the uplink transmission resource of the unauthorized carrier indicated by the UL grant by using the adjusted PUSCH transmitting power. Namely, a new DCI format is formed by improving the UL grant message and introducing new information bits, and is used for scheduling the transmission of the UL grant message by a service carrier PUSCH under an LAA scene so as to improve the reliability and the throughput of uplink transmission. In addition, the invention has lower complexity in implementation, and can realize the increase of the reliability or the efficiency of the LAA uplink transmission only by small overhead.
In another embodiment of the present invention, the ue 310 is configured to send an uplink scheduling request and a buffer status report to the base station during uplink transmission, and is further configured to calculate the PUSCH transmission power P of the unlicensed carrier according to the indication information in the UL grant message by using the first formulaPUSCH,c(i) And performing uplink transmission on the uplink transmission resource of the unlicensed carrier indicated by the UL grant by using the adjusted PUSCH transmitting power. Wherein the first formula is:
wherein c represents the indicated unlicensed carrier; i represents the ith subframe;
the maximum transmitting power of the user terminal on the non-authorized carrier c subframe i is represented as a linear value;
represents the transmission power of the PUCCH channel on the subframe i; mPUSCH,c(i) PUSCH represented on unlicensed carrier c subframe iChannel transmission bandwidth, i.e. number of PRBs; pO_PUSCH,c(j) The transmission power reference value of each physical resource block on the PUSCH on the unauthorized carrier c is shown, the transmission power reference value of each PRB of the PUSCH set by the high-level signaling comprises two parts of cell nominal power and specific UE nominal power, the high-level signaling informs that different j values represent different meanings, and P is PO_PUSCH,c(j) The values are also different, for example, j-0 indicates power control for semi-persistent scheduling, j-1 indicates power control for dynamic scheduling, j-2 indicates power control for message3, αc(j) Representing the path loss compensation of the unlicensed carrier c, indicated by a high-level signaling, different values of j, representing different meanings, αc(j) The value ranges are also different, and for the value range 0-1 of j, the value range is configured by higher layer signaling, for example αc(2)＝1；PLcRepresenting the downlink path loss; deltaTF,c(i) Indicating the power offset of the unauthorized carrier c determined by the modulation coding mode and the data type; f. ofc(i) The power control adjustment value of the unauthorized carrier c is shown, if the power value is adjusted in an accumulative value mode, the power control adjustment value is used for indicating the unauthorized carrier c
fc(i)＝fc(i-1)+δPUSCH,c(i-KPUSCH)+θboosting,c(i)
If the power increasing value is adjusted by adopting an absolute value mode, then
fc(i)＝δPUSCH,c(i-KPUSCH)+θboosting,c(i)
Wherein, deltaPUSCH,c(i-KPUSCH) For sub-frames i-K in UL grant messagePUSCHBy a specified parameter ofboosting,c(i) The value is adjusted for the TPC for the unlicensed carrier c.
And the base station 320 is configured to select a corresponding unlicensed carrier according to the buffer status report of the user terminal, the current load conditions of all carriers, and the unlicensed carrier interference conditions, and send an uplink scheduling grant UL grant message to the user terminal, where the UL grant message includes unlicensed carrier indication information used for uplink transmission of the user terminal, a modulation and coding scheme, uplink transmission resource allocation information, and a TPC adjustment value for transmission power control of the unlicensed carrier.
In this embodiment, the additional TPC information bit is at least 1bit and is used for Power boosting range indication. The range of Power boosting performed by the user terminal cannot be too large, and the interference to the adjacent cells caused by the fact that the uplink Power deviates from the original distributed Power and is too high is avoided.
The relation between the new TPC bit information and the Power boosting range is defined by a protocol, an accumulated value and an absolute value can be simultaneously defined, the conversion between the adjustment modes is semi-static, specifically, the absolute value adjustment or the relative accumulated value adjustment is determined by a base station and is informed to a terminal through a special RRC signaling (Uplink Power Control determined: accumulation Enabled).
In the embodiment of the present invention, power is increased by adding a TPC information bit in the UL grant message, the PUSCH transmission power of the carrier c is calculated according to the TPC information bit by using the first formula, and uplink transmission is performed on the uplink transmission resource of the unlicensed carrier indicated by the UL grant according to the adjusted PUSCH transmission power, so that reliability of uplink transmission can be improved.
Thus far, the present invention has been described in detail. Some details well known in the art have not been described in order to avoid obscuring the concepts of the present invention. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
The method and apparatus of the present invention may be implemented in a number of ways. For example, the methods and apparatus of the present invention may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically indicated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.
Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (4)
1. A method for improving uplink transmission performance of LAA, comprising:
when the user terminal carries out uplink transmission, the user terminal sends an uplink scheduling request and a buffer status report to the base station;
the base station selects corresponding unauthorized carriers according to a cache state report of the user terminal, the current load conditions of all carriers and the unauthorized carrier interference conditions, and sends an uplink scheduling authorization (UL grant) message to the user terminal, wherein the UL grant message comprises unauthorized carrier indication information, a modulation coding mode, uplink transmission resource allocation information and power adjustment information used for uplink transmission of the user terminal, and the power adjustment information comprises a Transmission Power Control (TPC) adjustment value used for the unauthorized carriers;
after receiving the UL grant message, the user terminal carries out idle channel assessment on the unauthorized carrier, if the unauthorized carrier is available, the sum of the PUSCH transmitting power of each indicated uplink scheduling carrier is calculated and compared with the maximum transmitting power of the user terminal at the current moment, if the transmitting power is left, the PUSCH transmitting power P of the indicated physical uplink shared channel of the unauthorized carrier is calculated by using a first formula according to the indicating information in the UL grant messagePUSCH,c(i) And performing uplink transmission on uplink transmission resources of the unlicensed carrier indicated by the UL grant by using the adjusted PUSCH transmitting power, wherein the first formula is as follows:
where c denotes the indicated unlicensed carrier, i denotes the ith subframe,
representing the maximum transmit power of the user terminal on the unlicensed carrier c sub-frame i,
denotes the transmit power, M, of the PUCCH channel on subframe iPUSCH,c(i) Indicating the transmission bandwidth, P, of the PUSCH channel on the unlicensed carrier c sub-frame iO_PUSCH,c(j) Indicating a reference value for the transmit power of each physical resource block on the PUSCH channel on the unlicensed carrier c, αc(j) Represents the amount of path loss compensation, PL, for the unlicensed carrier ccIndicating the downstream path loss, △TF,c(i) Indicating the power offset, f, of the unlicensed carrier c determined by the modulation and coding scheme and the data typec(i) The power control adjustment value of the unauthorized carrier c is shown, if the power value is adjusted in an accumulative value mode, the power control adjustment value is used for indicating the unauthorized carrier c
fc(i)＝fc(i-1)+δPUSCH,c(i-KPUSCH)+θboosting,c(i)
Wherein, deltaPUSCH,c(i-KPUSCH) For sub-frames i-K in UL grant messagePUSCHBy a specified parameter ofboosting,c(i) The value is adjusted for the TPC for the unlicensed carrier c.
2. The method of claim 1,
if the power increase value is adjusted in an absolute value mode, the PUSCH transmitting power P of the unauthorized carrier wave is calculated by using a first formulaPUSCH,c(i) Wherein f isc(i) Comprises the following steps:
fc(i)＝δPUSCH,c(i-KPUSCH)+θboosting,c(i)
wherein deltaPUSCH,c(i-KPUSCH) For sub-frames i-K in UL grant messagePUSCHBy a specified parameter ofboosting,c(i) The value is adjusted for the TPC for the unlicensed carrier c.
3. A system for improving LAA uplink transmission performance, comprising:
the user terminal is used for sending an uplink scheduling request and a buffer status report to the base station when uplink transmission is carried out; and the system is also used for carrying out idle channel evaluation on the unauthorized carrier after receiving the UL grant message, if the unauthorized carrier channel is idle and available, calculating the sum of the PUSCH transmitting power of each indicated uplink scheduling carrier, comparing the sum with the maximum transmitting power of the user terminal at the current moment, and if the transmitting power is left, calculating the PUSCH transmitting power P of the indicated physical uplink shared channel of the unauthorized carrier by using a first formula according to the indicating information in the UL grant messagePUSCH,c(i) And performing uplink transmission on uplink transmission resources of the unlicensed carrier indicated by the UL grant by using the adjusted PUSCH transmitting power;
the base station is used for selecting corresponding unauthorized carriers according to a cache state report of the user terminal, the current load conditions of all carriers and the interference conditions of the unauthorized carriers, and sending an uplink scheduling authorization (UL grant) message to the user terminal, wherein the UL grant message comprises unauthorized carrier indication information, a modulation coding mode, uplink transmission resource allocation information and power adjustment information used for uplink transmission of the user terminal, and the power adjustment information comprises a Transmission Power Control (TPC) adjustment value used for the unauthorized carriers;
wherein the first formula is:
where c denotes the indicated unlicensed carrier, i denotes the ith subframe,
representing the maximum transmit power of the user terminal on the unlicensed carrier c sub-frame i,
denotes the transmit power, M, of the PUCCH channel on subframe iPUSCH,c(i) Indicating PUSCH channel transmission on unlicensed carrier c sub-frame iTransmission bandwidth, PO_PUSCH,c(j) Indicating a reference value for the transmit power of each physical resource block on the PUSCH channel on the unlicensed carrier c, αc(j) Represents the amount of path loss compensation, PL, for the unlicensed carrier ccIndicating the downstream path loss, △TF,c(i) Indicating the power offset, f, of the unlicensed carrier c determined by the modulation and coding scheme and the data typec(i) The power control adjustment value of the unauthorized carrier c is shown, if the power value is adjusted in an accumulative value mode, the power control adjustment value is used for indicating the unauthorized carrier c
fc(i)＝fc(i-1)+δPUSCH,c(i-KPUSCH)+θboosting,c(i)
Wherein, deltaPUSCH,c(i-KPUSCH) For sub-frames i-K in UL grant messagePUSCHBy a specified parameter ofboosting,c(i) The value is adjusted for the TPC for the unlicensed carrier c.
4. The system of claim 3,
the user terminal is used for calculating the PUSCH transmitting power P of the unauthorized carrier wave by using a first formula if the power increase value is adjusted in an absolute value modePUSCH,c(i) Wherein f isc(i) Comprises the following steps:
fc(i)＝δPUSCH,c(i-KPUSCH)+θboosting,c(i)
wherein deltaPUSCH,c(i-KPUSCH) For sub-frames i-K in UL grant messagePUSCHBy a specified parameter ofboosting,c(i) The value is adjusted for the TPC for the unlicensed carrier c.
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| CN110169171B (en) * | 2017-07-10 | 2021-10-15 | 华为技术有限公司 | Method and device for transmitting data |
| CN113039849A (en) * | 2018-11-01 | 2021-06-25 | 谷歌有限责任公司 | Multiple uplink carriers in a cell deployed in unlicensed spectrum |
| US11350451B2 (en) * | 2018-11-08 | 2022-05-31 | Acer Incorporated | Method of handling communication in unlicensed spectrum and related communication device |
| CN111385887B (en) * | 2018-12-29 | 2023-05-09 | 中兴通讯股份有限公司 | Method, device, equipment and storage medium for transmitting data |
| CN111867102B (en) * | 2020-06-25 | 2023-04-07 | 达闼机器人股份有限公司 | Resource transmission method, device, storage medium, network equipment and terminal |
| CN112367712B (en) * | 2020-10-29 | 2023-03-31 | 国网甘肃省电力公司信息通信公司 | Power wireless private network uplink resource scheduling method based on path loss |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014200951A2 (en) * | 2013-06-11 | 2014-12-18 | Qualcomm Incorporated | Lte/lte-a uplink carrier aggregation using unlicensed spectrum |
| WO2015042594A2 (en) * | 2013-09-23 | 2015-03-26 | Qualcomm Incorporated | Lte-u uplink waveform and variable multi-subframe scheduling |
| WO2015113252A1 (en) * | 2014-01-29 | 2015-08-06 | 华为技术有限公司 | Data processing method and device |
| CN104917597A (en) * | 2014-03-13 | 2015-09-16 | 上海朗帛通信技术有限公司 | Transmission method on non-authorized spectrum and device |
Family Cites Families (1)
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|---|---|---|---|---|
| WO2012169756A2 (en) * | 2011-06-06 | 2012-12-13 | 엘지전자 주식회사 | Multiplexing method for signals related to a plurality of terminals in a wireless communication system applying carrier aggregation techniques and apparatus therefor |
-
2015
- 2015-10-30 CN CN201510726698.XA patent/CN106658740B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014200951A2 (en) * | 2013-06-11 | 2014-12-18 | Qualcomm Incorporated | Lte/lte-a uplink carrier aggregation using unlicensed spectrum |
| WO2015042594A2 (en) * | 2013-09-23 | 2015-03-26 | Qualcomm Incorporated | Lte-u uplink waveform and variable multi-subframe scheduling |
| WO2015113252A1 (en) * | 2014-01-29 | 2015-08-06 | 华为技术有限公司 | Data processing method and device |
| CN104917597A (en) * | 2014-03-13 | 2015-09-16 | 上海朗帛通信技术有限公司 | Transmission method on non-authorized spectrum and device |
Non-Patent Citations (1)
| Title |
|---|
| Physical layer procedures;3GPP TSG RAN;《3GPP TS 36.213 V12.7.0》;20150925;第5.1.1.1节第12-16页 * |
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