CN101729108A - Method and device for reporting power margin information - Google Patents
Method and device for reporting power margin information Download PDFInfo
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Abstract
The invention provides a method and a device for reporting power margin information. The method comprises the following step that: user equipment (UE) informs a base station of the PH information by using residual bits in a media access control sub-layer protocol data unit (MACPDU) when the number of the residual bits in the MACPDU sent to the base station by the UE is greater than or equal to the number of the bits occupied by the PH information and when the MACPDU does not include corresponding PH information sent this time. The method and the device for reporting power margin information can enable the base station to know practical power margin information of the UE in time so as to enhance the uniformity of the base station and the UE for understanding the PH information.
Description
Technical Field
The present invention relates to power control technology in a mobile communication system, and in particular, to a method and apparatus for reporting Power Headroom (PH) information.
Background
In the existing Long Term Evolution (LTE) system, the PH information is information for identifying a UE-side power headroom. This information is obtained by the UE according to the formula PH Pmax-Ppusch. The PH is a power headroom, Pmax is a maximum transmission power of the UE, and Ppusch is a power used by an uplink shared channel (PUSCH) carrying the PH information. In practical application, the UE may adjust Ppusch according to a TPC power control adjustment command word of a PUSCH channel generated by a physical layer. The TPC power control adjustment command word is generated by comparing the actual received signal condition on the uplink PUSCH channel of the UE by the base station with a target value preset by the system, and if the actual received signal is lower than the target value, the base station informs the UE to adjust the transmit power up through the TPC power control adjustment command word, and at this time, the UE will increase the transmit power at the time of PUSCH transmission at the corresponding time; if the received actual signal is higher than the target value, the base station informs the UE to adjust the transmission power downwards through the TPC power control adjustment command word, and at the moment, the UE reduces the transmission power correspondingly during the PUSCH transmission at the corresponding moment.
And after the PH information is obtained by the UE according to the method, reporting the PH information to the base station side according to a certain reporting mechanism. When a medium access control sublayer (MAC) on a base station side schedules and allocates resources to a User Equipment (UE), power headroom information (PH) on the UE side needs to be considered, so as to ensure that power required by the MAC to allocate the resources to the UE does not exceed the maximum transmission power of the UE. If the understanding of the PH is not consistent enough between the UE and the base station, the accuracy of the base station's resource allocation and power requirements for the UE will be affected. For example, if the power margin of the UE saved by the base station side is higher than the power margin at the time corresponding to the UE side, the power required by the PUSCH resource allocated by the base station to the UE may not exceed the maximum transmission power of the UE for the base station, but may already exceed the maximum transmission power of the UE for the UE, and in this case, due to the limitation of the maximum transmission power of the UE, the power corresponding to the PUSCH data actually transmitted by the UE may not meet the expected requirement of the network. Conversely, if the power headroom of the UE understood by the base station is lower than the actual power headroom of the UE, it may happen that the resource allocated by the network for the UE is reserved for the UE, thereby resulting in that the single transmission throughput of the UE cannot be maximized. Therefore, the accuracy of the PH information maintained by the base station, that is, the consistency of understanding the PH between the UE and the base station, will have a great influence on the optimal configuration of resources.
Currently, the UE reports the PH information to the base station through a power headroom control element (PH CE) in a MAC protocol data unit (MAC PDU). The MAC PDU in the existing protocol mainly includes the following parts: a MAC PDU header, 0 or more MAC service data units (MAC SDUs), 0 or more MAC control units (MAC CEs). Wherein, the MAC PDU head contains 1 or more MAC PDU subheads, and each MAC PDU subhead corresponds to 1 MAC SDU or 1 MAC CE or filling bit. The MAC CE including the PH information is called a PH CE, and accordingly, the MAC PDU subheader corresponding to the MAC CE is the MAC PDU subheader corresponding to the PH CE, and in addition, the lengths of 1 PH CE and the MAC PDU subheader corresponding thereto are 8 bits. In the existing protocol, the size of an uplink MAC PDU sent by a UE is directly specified by base station authorization, if data (including contents of a MAC CE and a MAC SDU) to be sent by an actual UE is smaller than the specified size, whether a Buffer status indication control unit (BSR CE) of a padding type exists or not is considered (Buffer data caching situation of the UE), and if there are remaining bits after the BSR CE of the padding type is included, the length of the MAC PDU to be sent is satisfied by using a padding bit method.
The existing methods for triggering the UE to report the PH information to the base station include the following steps:
1. when the variation amplitude of the path loss measured by the UE reaches a preset threshold, a reporting prohibition timer is overtime, and meanwhile, uplink authorization can send data, the UE triggers the reporting of PH information to a base station, wherein the reporting prohibition timer is used for limiting the time for prohibiting the reporting of the PH information;
2. and presetting a PH reporting period, and when one PH reporting period expires and uplink authorization can send data, triggering and reporting the PH information to the base station by the UE.
In the method for reporting PH information, if the preset threshold of the path loss variation range is set to be larger, or the PH reporting period is set to be longer, the interval between two times of obtaining the PH information by the base station may be longer. During the longer time interval, the base station and the UE respectively maintain the PH information stored in them, and during this time, the base station may adjust the transmit power of the UE through the TPC power control adjustment command word, and the TPC power control adjustment command word may have an error in actual transmission, which causes the Ppusch obtained by the UE according to the adjustment of the erroneous TPC power control adjustment command word to be inconsistent with the Ppusch understood by the base station, and accordingly, the PHs obtained by the base station and the UE according to the respectively understood Ppusch will also be inconsistent.
Therefore, the existing method for reporting the PH information may cause inconsistency between the base station and the UE in understanding the PH information.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for reporting PH information, which can improve consistency of understanding of the PH information by a base station and a UE.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the method for reporting the power headroom information comprises the following steps:
when the remaining bit number in the MAC PDU sent by the UE to the base station is larger than or equal to the bit number occupied by the PH information and the MAC PDU does not contain the PH information corresponding to the sending, the UE informs the base station of the PH information by using the remaining bit number in the MAC PDU.
Preferably, the method further comprises:
and when the variation amplitude of the path loss measured by the UE reaches a preset threshold, and the report prohibition timer is overtime and the UE is authorized by the uplink to send data, the UE sends an MAC PDU carrying PH information to the base station.
Preferably, the method further comprises: and when a preset PH reporting period expires and the UE is authorized by an uplink to send data, the UE sends an MAC PDU carrying PH information to the base station.
Preferably, when the remaining number of bits is greater than or equal to the length of the PH CE used for storing the PH information, the PH CE is located after the valid data portion in the MAC PDU or the last MAC CE in the MAC PDU.
Preferably, when the remaining number of bits is greater than or equal to the sum of the lengths of the PH CEs and the MAC PDU subheaders corresponding thereto, the MAC PDU subheaders are located at the last MAC PDU subheader in the MAC PDUs or behind the MAC PDU subheader corresponding to the last MAC CE in the MAC PDUs.
The device for reporting the power headroom information provided by the invention comprises the following components:
the protocol data unit generating module is used for generating an MAC PDU (media access control protocol data unit), outputting the MAC PDU to the protocol data unit sending module, and storing the PH information in the MAC PDU when the residual bit number in the MAC PDU is more than or equal to the bit number occupied by the PH information and the MAC PDU does not contain the PH information corresponding to the sending;
and the protocol data unit sending module is used for sending the MAC PDU from the protocol data unit generating module to the base station.
Preferably, the protocol data unit generating module is further configured to generate an MAC PDU carrying PH information and send the MAC PDU to the protocol data unit sending module when the change amplitude of the path loss measured by the UE reaches a preset threshold, the report prohibit timer is overtime, and the UE is authorized by the uplink to send data.
Preferably, the protocol data unit generating module is further configured to generate an MAC PDU carrying PH information and send the MAC PDU to the protocol data unit sending module when a preset PH reporting period expires and the UE is authorized by the uplink to send data.
Preferably, the pdu generating module is further configured to set the PH CE in the MAC when the remaining number of bits is greater than or equal to the length of the PH CE used for storing the PH information
The valid data part or the last MAC CE in the PDU.
Preferably, the PDU generating module is further configured to locate the MAC PDU subheader after the last MAC PDU subheader in the MAC PDU or the MAC PDU subheader corresponding to the last MAC CE when the remaining number of bits is greater than or equal to the sum of the lengths of the PH CE and the MAC PDU subheader corresponding thereto.
In summary, according to the method and the device for reporting PH information provided by the present invention, the MAC PDU with padding bits carries the PH information corresponding to the data currently sent by the UE, so that the base station can timely obtain the actual power headroom information of the UE, and thus the consistency of understanding the PH information by the base station and the UE can be improved.
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Fig. 1 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The main idea of the invention is as follows: in order to ensure that the power headroom information of the UE maintained by the base station is consistent with the actual power headroom information of the UE side as much as possible, the UE needs to send its own PH information to the base station as soon as possible. Therefore, the invention provides that the MAC PDU with the surplus bit carries the PH information corresponding to the current data sent by the UE, so that the base station can possibly acquire the actual power headroom information of the UE as long as data transmission exists, the base station can acquire the actual power headroom information of the UE as soon as possible, the accuracy of the PH information maintained by the base station is improved, and simultaneously, the resource overhead generated when the UE needs to report the PH information to the base station specially in the prior art can be avoided.
The first embodiment of the method of the invention mainly comprises the following steps:
The remaining bits refer to bits that are not filled after all valid data, filled BSR CE information, and corresponding MAC PDU subheader information are placed in a MAC PDU of a preset length, and the part of bits are filled with filling bits in the existing protocol.
Here, the PH information is usually carried by a PH CE in a MAC PDU, and therefore, usually, only when remaining bits in the MAC PDU allow at least 1 PH CE to be placed, the MAC PDU may carry the PH information, that is, when the remaining number of bits in the MAC PDU sent by the UE to the base station in this step is greater than or equal to the number of bits occupied by the PH information, the following steps are performed: and the remaining bit number in the MAC PDU is greater than or equal to the length of a PH control unit PH CE used for storing the PH information, and at the moment, the MAC PDU carries the PH CE. In specific implementation, the PH CE may be directly connected in series to the valid data portion in the MAC PDU, or may be connected in series to the last MAC CE in the MAC PDU, and when the base station receives the MAC PDU, the base station may detect the PH information at the above location.
In addition, when the remaining bit number is greater than or equal to the sum of the lengths of the PH CE and the MAC PDU subheader corresponding thereto, the MAC PDU may further carry the MAC PDU subheader corresponding to the PH CE, so that after the base station receives the MAC PDU, the PH information may be searched from the MAC PDU according to the indication of the MAC PDU subheader, and thus consistency of understanding the PH information between the UE and the NB may be further improved. In addition, in specific implementation, the MAC PDU subheader may be located after a MAC PDU subheader corresponding to a last MAC CE in the MAC PDU, or may be located after a last MAC PDU subheader in the MAC PDU.
Preferably, step 101 may be further combined with one or more existing methods for reporting PH information to further improve the consistency of the base station and the UE in understanding the PH information, for example, the present invention may further include:
when the variation amplitude of the path loss measured by the UE reaches a preset threshold, a report prohibition timer is overtime, and the UE can send data by uplink authorization, the UE sends an MAC PDU (media access control protocol data Unit) carrying PH information to a base station; or,
and when a preset PH reporting period expires and the UE is authorized by an uplink to send data, the UE sends an MAC PDU carrying PH information to the base station.
Therefore, even if the sent MAC PDU cannot carry PH information in a period of time due to extreme conditions such as busy data transmission, the UE can still report the PH information to the base station in time by utilizing the existing trigger mechanism for reporting the PH information, and the consistency of understanding the PH information by the base station and the UE is further ensured.
The method for reporting the power headroom information in the embodiment of the present invention is described in detail above, and the apparatus for reporting the power headroom information in the embodiment of the present invention is described in detail below.
Fig. 1 is a schematic structural diagram of an apparatus for reporting power headroom information according to an embodiment of the present invention. As shown in fig. 1, the apparatus includes: a protocol data unit generating module 101 and a protocol data unit sending module 102.
The protocol data unit generating module 101 is configured to generate an MAC PDU, output the MAC PDU to the protocol data unit transmitting module 102, and store PH information in remaining bits of the MAC PDU when the remaining bit number in the MAC PDU is greater than or equal to a bit number occupied by the PH information and the MAC PDU does not include PH information corresponding to this transmission;
a protocol data unit sending module 102, configured to send the mac pdu from the protocol data unit generating module 101 to the base station.
Preferably, the protocol data unit generating module 101 is further configured to generate an MAC PDU carrying PH information and send the MAC PDU to the protocol data unit sending module 102 when the variation amplitude of the path loss measured by the UE reaches a preset threshold, and the report prohibit timer is overtime and the UE is authorized by the uplink and can send data at this time;
preferably, the protocol data unit generating module 101 is further configured to generate an MAC PDU carrying PH information and send the MAC PDU to the protocol data unit sending module 102 when a preset PH reporting period expires and the UE is authorized by the uplink and can send data at this time;
preferably, the PDU generating module 101 is further configured to locate the PH CE after the last MAC CE or the valid data part in the MAC PDU when the remaining number of bits is greater than or equal to the length of the PH CE used for storing the PH information.
Preferably, the PDU generating module 101 is further configured to locate the MAC PDU subheader behind the last MAC PDU subheader in the MAC PDU or the MAC PDU subheader corresponding to the last MAC CE when the remaining number of bits is greater than or equal to the sum of the lengths of the PH CE and the MAC PDU subheader corresponding thereto.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for reporting PH information is characterized in that the method comprises the following steps:
when the remaining bit number in a media access control sub-layer protocol data unit (MAC PDU) sent to a base station by User Equipment (UE) is greater than or equal to the bit number occupied by PH information and the MAC PDU does not contain the PH information corresponding to the sending, the UE informs the base station of the PH information by using the remaining bit number in the MAC PDU.
2. The method of claim 1, further comprising:
and when the variation amplitude of the path loss measured by the UE reaches a preset threshold, and the report prohibition timer is overtime and the UE is authorized by the uplink to send data, the UE sends an MAC PDU carrying PH information to the base station.
3. The method of claim 1, further comprising: and when a preset PH reporting period expires and the UE is authorized by an uplink to send data, the UE sends an MAC PDU carrying PH information to the base station.
4. The method according to any of claims 1 to 3, wherein when the remaining number of bits is greater than or equal to the length of a PH control element (PH CE) used for storing the PH information, the PH CE is located after a valid data portion in the MAC PDU or a last MAC CE in the MAC PDU.
5. The method according to claim 4, wherein the MAC PDU subheader is located at or after the last MAC PDU subheader of the MAC PDU or the MAC PDU subheader corresponding to the last MAC CE of the MAC PDU when the remaining number of bits is greater than or equal to the sum of the lengths of the PH CEs and the MAC PDU subheaders corresponding thereto.
6. An apparatus for reporting power headroom information, the apparatus comprising:
the protocol data unit generating module is used for generating an MAC PDU (media access control protocol data unit), outputting the MAC PDU to the protocol data unit sending module, and storing the PH information in the MAC PDU when the residual bit number in the MAC PDU is more than or equal to the bit number occupied by the PH information and the MAC PDU does not contain the PH information corresponding to the sending;
and the protocol data unit sending module is used for sending the MAC PDU from the protocol data unit generating module to the base station.
7. The apparatus of claim 6, wherein the PDU generating module is further configured to generate an MAC PDU carrying PH information and send the MAC PDU to the PDU sending module when a change amplitude of a path loss measured by the UE reaches a preset threshold, and the report prohibit timer is overtime and the UE is authorized by the uplink to send data.
8. The apparatus of claim 6, wherein the PDU generating module is further configured to generate a MAC PDU carrying PH information and send the MAC PDU to the PDU sending module when a preset PH reporting period expires and the UE is authorized by the uplink for sending data.
9. The apparatus according to any of claims 6 to 8, wherein the PDU generating module is further configured to locate the PH CE after a valid data portion or a last MAC CE in the MAC PDU when the remaining number of bits is greater than or equal to a length of the PHCE used for storing the PH information.
10. The apparatus of claim 9, wherein the protocol data unit generating module is further configured to locate the MAC PDU subheader after a last MAC PDU subheader in the MAC PDU or a MAC PDU subheader corresponding to a last MAC CE when the remaining number of bits is greater than or equal to a sum of the lengths of the PH CEs and the MAC PDU subheaders corresponding thereto.
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