Nokia Technologies Oy

Shanghai Research Center for Wireless Communications

Huiyue Yi

Honglin Hu

Haitao Li

Kodo Shu

Jing Liu

Haipeng Lei

Hong Li

Jing Xu

Jiang Wang

Zhi Yuan

Xiumei Yang

Huawen Bu

Yang Yang

Hu Honglin

An Internet of things (IoT) device random access method based on a massive MIMO technology is disclosed, and a cellular IoT communication system using the random access method is also disclosed. In the method, multiples users access a base station by using the same preamble sequence, the users accessing the base station in different beams respectively. By use of narrow beam characteristics of a massive MIMO technology, users in different beams can use the same preamble sequence for random access, thus greatly reducing collision probability of the random access and greatly increasing the number of users of random access, and congestion and collision problems during random access of a great number of users in the cellular IoT communication system can be effectively solved.

Internet of things device random access method and system based on massive MIMO technology

An uplink pilot sequence allocation method in a massive MIMO system is disclosed, the system including the master base station in the master cell and a neighboring base station in a neighboring cell, including: the neighboring base station comparing a primary eigen-space between a user group of the neighboring cell and the neighboring base station, with an interference eigen-space between a user group of the master cell close to the neighboring base station and the neighboring base station, and determining whether the user group of the neighboring cell can reuse uplink pilot sequence resources used by the user group of the master cell. In a manner of increasing information exchange, intercell cooperative uplink pilot sequence allocation is achieved, and uplink pilot contamination in a multi-cell massive MIMO system is reduced effectively.

Uplink pilot sequence allocation method in massive MIMO system and base station thereof

The present invention provides a system and method for avoiding mobile relay interference to a primary system on an authorized frequency spectrum. In accordance with the system, and with an available-spectrum information provision unit which communicates with the primary system, determine, in accordance with operation information coming from said primary system, authorized-spectrum available-spectrum information capable of being used by a mobile relay when said mobile relay is located in various positional regions surrounding the primary system, and provide the available-spectrum information corresponding to each positional region to a secondary system; using the secondary system and based on the available-spectrum information corresponding to the various positional regions, determine at least one of the positional regions of the primary system, which is experiencing interference from a mobile relay located within the range of base station coverage within the secondary system, and provide each determined positional region to each mobile relay.

System and method for avoiding mobile relay interference to primary system on authorized frequency spectrum

Embodiments of the disclosure provide methods and apparatuses for managing a COMP set in a communication system employing an ASA scheme. According to the method, change information about an affected cell is received, wherein the change information uses an ASA frequency band and overlaps with a protected area of a primary system authorized with the ASA frequency band. The change information is then sent to a serving node coordinating transmission within constituent cells of a CoMP set, to indicate a change of the CoMP set, wherein the affected cell is one of the constituent cells of the CoMP set.

Method and apparatus for managing coordinated multi-point set

Provided are methods, corresponding apparatuses, and computer program products for performing out-of-band sensing on an unlicensed frequency band. A method comprises sending a configuration message for configuring measurement on at least one channel in a frequency band of a primary system; receiving a measurement report made based upon the configuration message; and determining the usability of the at least one channel based upon the measurement report, wherein the configuration message includes information regarding a respective predetermined threshold of energy detection or primary-system-feature detection, and the measurement report is for reception when a measured energy detection value or a measured primary-system-feature detection value of a received signal on the at least one channel is less than the respective predetermined threshold. With the claimed inventions, the spectrum efficiency would be improved and interference between a secondary system and an LTE system could be alleviated.

Methods, apparatuses, and computer program products for out-of-band sensing in a cognitive LTE system

A method includes, in response to a determination one or more quiet periods conflict with specified hybrid automatic repeat request feedback timing, sending one or more indicators to one or more user equipment to indicate to the user equipment to shift the specified hybrid automatic repeat request feedback timing to a shifted hybrid automatic repeat request feedback timing. The method includes communicating hybrid automatic repeat request feedback based on the shifted hybrid automatic repeat request feedback timing. Another method includes receiving at a user equipment one or more indicators indicating to the user equipment to shift specified hybrid automatic repeat request feedback timing to a shifted hybrid automatic repeat request timing, and communicating hybrid automatic repeat request feedback based on the shifted hybrid automatic repeat request timing. Apparatus, computer program product, and computer programs are also disclosed.

Shifting HARQ feedback for cognitive-radio-based TD-LTE systems

Embodiments of the disclosure provide methods and apparatuses for scheduling radio resources in a communication system. According to the method, in response to receiving a request for accessing a target frequency band utilized by a Macro BS and a LPN from a frequency-shared system, a first notification is transmitted to the Macro BS, such that the Macro BS deactivates the target frequency band, and a second notification is transmitted to the LPN, such that the LPN extends its coverage. Then, information on the extended coverage is received from the LPN.

Method and apparatus for scheduling radio resources

An apparatus, system, and method for a communication network that includes a picocell range expansion configuration on authorized shared access. A method may include determining, in a controller, at least one allowable maximal range expansion bias value for at least one picocell within a coverage area of a macrocell. The method may also include sending the determined allowable maximal range expansion bias value for the at least one picocell from the controller to the macrocell. A further method may include receiving at least one allowable maximal range expansion bias value for at least one picocell from a controller. The method may also include updating, by a macrocell, a range expansion bias value for each picocell within a macrocell based on the received allowable maximal range expansion bias value.

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