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Physical downlink control channel (PDCCH) self-adaptive transmission method and device
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An adaptive transmission and user technology, applied in connection management, wireless communication, power management, etc., can solve problems such as poor reliability of PDCCH, and achieve the effect of improving reliability
Active Publication Date: 2012-09-19
NANJING ZHONGXING XIN SOFTWARE CO LTD
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[0004] The purpose of the present invention is to provide a PDCCH adaptive transmission method and device for solving the problem of poor PDCCH reliability
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Embodiment 1
[0077] Let the target BLER of the user's PDCCH be 1%, StepUp is 0.99dB, StepDown is 0.01dB, the initially used CCE aggregation degree CCEinit is 8, the power value previously used by the user is 33.6dBm, and the outer loop factor of the current TTI user is DeltaPDCCH is -2dB, and the remaining PDCCH power Premaind is 60dBm.
[0078] If the user does not receive DCI1 and does not perform ACK / NACK feedback, the base station detects the user's DTX information in the current TTI, so the base station adds an upward adjustment step to the user's outer loop factor, and the current outer loop factor is -1.01 dB.
[0079] The base station determines the CCE aggregation degree set that can be allocated to the user according to the remaining CCE resources CCEremaind in the current TTI, let it be {4}, take a CCE aggregation degree from the CCE aggregation degree set that can be allocated to the user, and take out CCEalloc1, which is 4, The dB value PDCCHres of CCEalloc1 is calculated by ...
Embodiment 2
[0082] Let the target BLER of the user's PDCCH be 1%, StepUp is 0.99dB, StepDown is 0.01dB, the initially used CCE aggregation degree CCEinit is 8, the power value previously used by the user is 33.6dBm, and the outer loop factor of the current TTI user is DeltaPDCCH is -3.02dB, and the remaining PDCCH power Premaind is 30dBm.
[0083] The base station has not detected the user's DTX information in the current TTI, so the base station reduces the user's outer loop factor by a step-down StepDown, and the current outer loop factor is -3.03dB.
[0084] The base station determines the CCE aggregation degree set that can be allocated to the user according to the remaining CCE resources CCEremaind in the current TTI, let it be {2, 4}, and takes a smaller CCE aggregation degree from the CCE aggregation degree set that can be allocated to the user, and takes out CCEalloc1 is 2, and the dB value PDCCHres of CCEalloc1 is calculated by formula (3) to be -6dB. Using formula (4), the user...
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Abstract
The invention discloses a physical downlink control channel (PDCCH) self-adaptive transmission method and a PDCCH self-adaptive transmission device; the method comprises the following steps that: a base station adjusts an outer ring factor by detecting the discontinuous transmission (DTX) information of a user, so as to acquire a current outer ring factor; and the base station distributes a control channel element (CCE) resource and power which meet target block error ratio (BLER) for the PDCCH of the user according to the current outer ring factor, the rest available CCE resources and the current use power of the user. According to the invention, the CCE resources and power that the PDCCH uses are controlled by detecting the DTX information of the user by the base station, so that the reliability of the PDCCH is improved.
Description
technical field [0001] The present invention relates to a PDCCH (High Speed Physical Downlink Control Channel, physical downlink control channel) adaptive transmission technology, in particular to a PDCCH adaptive transmission method and device. Background technique [0002] LTE (Long-Term Evolution, long-term evolution) is a long-term evolution technology. The PDCCH is composed of a CCE (ControlChannel Element, control channel element), and is used to carry DCI (Downlink Control Information, downlink control information). [0003] In the multi-cell multi-user scenario, due to the different cell locations and states of each user, if some users are on foot and some are on a vehicle, adaptive transmission of PDCCH is required to ensure the reliability of PDCCH transmission . In the existing technology, the downlink quality information fed back by users such as CQI (Channel Quality Indicator, Channel Quality Indicator) and RSRP (Reference Signal Receiving Power, Reference S...
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