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311results about How to "Improve access success rate" patented technology

Narrowband Internet of Things NB-IoT random access method based on non-orthogonal technology

The invention provides a narrowband Internet of Things NB-IoT random access method based on the non-orthogonal technology. The narrowband Internet of Things NB-IoT random access method is applied to anarrowband Internet of Things random access method and is used for solving the problem of low random access success rate. The method comprises the following steps: 1-3, sending Msg1; 4, detecting, bya base station, multi-preamble of collision based on geographical distribution and transmitting RAR (that is, Msg2) with multiple users; 5, detecting, by a terminal, RAR; 6, estimating, by a user, TAby using an NPRS signal; 7, obtaining, by the user, RAR information, searching a TA value closest to the TA of the current user in the RAR, and obtaining corresponding Temp C-RNTI and Power BO; 8, transmitting Msg3, and opening a contention resolution timer CR; 9, separating the users based on the SIC technology; and 10-11, sending Msg4, and performing conflict resolution. According to the narrowband Internet of Things NB-IoT random access method, the multi-preamble detection and RAR reception are achieved by using the spatial distribution features of the user, the Msg3 is transmitted by using the non-orthogonal technology, the user separation is performed on the base station side, thereby effectively reducing the probability of preamble retransmission, improving the system capacity, andsolving the network congestion problem caused by large-scale connection of the NB-IoT system.
Owner:CHONGQING UNIV OF POSTS & TELECOMM

Virtual lead code based random access method of wireless mobile broadband system

InactiveCN101990311AImprove random access success rateReduce random access delayWireless communicationTime delaysRandom access memory
The invention relates to a virtual lead code based random access method of a wireless mobile broadband system. The method comprises the following steps: a base station sets a front lead code virtual resource tank and selects a lead code for a UE (User Equipment) meeting a non-competitive random access scene from a dedicated lead code package or a virtual resource tank; the UE transmits the distributed lead code to the base station in a corresponding random access channel; the base station judges whether the received lead code belongs to the virtual resource tank or not, if so, the corresponding time frequency resource information is distributed for the UE preferentially, and otherwise, ordinary random access flow is used for completing the random access; and the UE distributed with the virtual lead code finishes the random access process by the non-competitive random access flow according to the distributed time frequency resource information. The invention has simple and reliable method, does not need to physically change the base station or change the LTE (Long-Term Evolution) protocol, overcomes the shortage of the traditional non-competitive random access method, improves the random access success rate of the UE and reduces the random access time delay of the UE.
Owner:OCEAN UNIV OF CHINA

Long-term evolution system self-adaptation frequency deviation precorrection method under environment of high-speed rail

The invention discloses a long-term evolution system self-adaptation frequency deviation precorrection method under the environment of a high-speed rail. The long-term evolution system self-adaptation frequency deviation precorrection method under the environment of the high-speed rail is characterized by including the following steps: (1) distributing stations along railway by adopting the mode of a baseband processing unit (BBU) and a remote radio unit (RRU), transforming an uploading radio-frequency signal received by each RRU into a baseband signal and sending the baseband signal to the BBU, (2) conducting least squares (LS) channel estimation by the BBU according to the baseband signals sent by different RRUs based on an uploading reference signal, (3) calculating uploading frequency deviation of different user data correspondingly received by each RRU according to an LS estimated value on the reference signal. The long-term evolution system self-adaptation frequency deviation precorrection method under the environment of the high-speed rail is capable of increasing coverage area of single cell along the railway of long term evolution and LET-A system, reducing switchover and improving success rate of user access.
Owner:SOUTHEAST UNIV

Method for realizing wireless access of DMR (Digital Mobile Radio) digital-trunked grouped data

The invention relates to a method for realizing wireless access of DMR (Digital Mobile Radio) digital-trunked grouped data, which is characterized by comprising the following steps of: firstly, newly adding a data access application signaling in the upstream access process of the grouped data of a mobile station; secondly, realizing access control by adding corresponding fields in the data heads of response data on the downstream channel control of a base station; and thirdly, adding reserved access control parameter fields of tail blocks of the data to be confirmed in the downstream data sending process of the base station, then making the base station carry out channel access control while accomplishing downstream data sending to reserve time slots required for the mobile station to send the response data, and setting a channel-occupied identification in a common announcing channel, thereby ensuring that the mobile station can occupy response data information returned by the channel in time. The invention improves the channel access success rate of the mobile station in the process of transmitting the grouped data, reduces time slot waste caused by collision when the grouped data is randomly accessed to the channel and improves the utilization rate of the channel.
Owner:NEOLINK COMM TECH HANGZHOU +1
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