Method, terminal and server for allocating Narrow Band Internet of Things system resources
Embodiments of the present application belong to the field of NB-IoT, and relate to a method, terminal and server for allocating NB-IoT system resources, capable of satisfying the requirements of traffic rate and communication quality simultaneously. The method comprises the following steps of: acquiring a traffic request of a first terminal; determining bearing carriers and the number of the bearing carriers required for bearing downlink data of the first terminal based on candidate carriers information and downlink traffic rate requirement; determining target downlink transmitting power of each of the bearing carriers based on the reception quality information, the determined bearing carriers, the determined number of the bearing carriers and the reception strength information; and determining to transmit the downlink data of the first terminal on an i-th bearing carrier using the determined target downlink transmitting power if a total downlink transmitting power of the i-th bearing carrier is less than or equal to a first preset threshold.
1. A method for allocating NB-IoT system resources, wherein the method comprises the following steps of:
acquiring a traffic request of a first terminal, wherein the traffic request includes: (1) downlink traffic rate requirement; (2) reception strength information, wherein the reception strength information includes one or more of a reception strength of a primary synchronization signal, a reception strength of a secondary synchronization signal and a reception strength of a reference signal in a serving base station of the first terminal; (3) reception quality information, wherein the reception quality information includes one or more of a reception quality of the primary synchronization signal, a reception quality of the secondary synchronization signal and a reception quality of the reference signal in the serving base station; and (4) traffic priority identifier information;
determining bearing carriers and the number of the bearing carriers required for bearing downlink data of the first terminal N based on candidate carriers information and the downlink traffic rate requirement, wherein N≥1;
determining target downlink transmitting power of each of the bearing carriers based on the reception quality information, the determined bearing carriers, the determined number of the bearing carriers and the reception strength information; and
determining to transmit the downlink data of the first terminal on an i-th bearing carrier using the determined target downlink transmitting power if a total downlink transmitting power of the i-th bearing carrier is less than or equal to a first preset threshold.
2. The method according to claim 1 , wherein the process of determining target downlink transmitting power of each of the bearing carriers based on the reception quality information, the determined bearing carriers, the determined number of the bearing carriers and the reception strength information comprises:
determining a modulation coding scheme allowed for the downlink data of the first terminal based on the reception quality information;
determining the number and positions of resource blocks on each of the bearing carriers based on the determined bearing carriers, the determined number of the bearing carriers and the determined modulation coding scheme;
determining the target downlink transmitting power of each of the bearing carriers based on the reception strength information, the determined modulation coding scheme and the determined number of the resource blocks.
3. The method according to claim 2 , wherein the process of determining target downlink transmitting power of each of the bearing carriers based on the reception strength information, the determined modulation coding scheme and the determined number of the resource blocks comprises:
determining a maximum coupling loss between the serving base station and the first terminal based on the transmitting power information in the serving base station and the reception strength information in the traffic request, wherein the transmitting power information includes one or more of the transmitting power of the primary synchronization signal, the transmitting power of the secondary synchronization signal and the transmitting power of the reference signal in the serving base station;
determining a minimum received power requirement of the resource blocks on each of the bearing carriers based on the determined modulation coding scheme and the determined number of the resource blocks; and
determining the target downlink transmitting power of each of the bearing carriers based on the maximum coupling loss and the minimum received power requirement.
4. The method according to claim 1 , wherein the method further comprises:
determining to boost the available downlink transmitting power of the i-th bearing carrier if the total downlink transmitting power of the i-th bearing carrier is higher than the first preset threshold and a current total downlink transmitting power of the serving base station is less than or equal to a second preset threshold, so that the downlink data of the first terminal is transmitted on the i-th bearing carrier using the determined target downlink transmitting power.
5. The method according to claim 4 , wherein the method further comprises:
determining to boost the available downlink transmitting power of the i-th bearing carrier if the total downlink transmitting power of the i-th bearing carrier is higher than the first preset threshold, the current total downlink transmitting power of the serving base station is higher than the second preset threshold and there is a terminal whose traffic priority is lower than that of the first terminal in the terminals served by the serving base station, so that the downlink data of the first terminal is transmitted on the i-th bearing carrier using the determined target downlink transmitting power.
6. The method according to claim 5 , wherein the method further comprises:
determining to drop the downlink transmitting power of a terminal whose traffic priority is lower than that of the first terminal or to not schedule the downlink data of the terminal whose traffic priority is lower than that of the first terminal at the current scheduling time.
7. The method according to claim 5 , wherein the method further comprises:
sending a traffic request rejection message if the total downlink transmitting power of the i-th bearing carrier is higher than the first preset threshold, the current total downlink transmitting power of the serving base station is higher than the second preset threshold and there are no terminals whose traffic priority is lower than that of the first terminal in the terminals served by the serving base station.
8. The method according to claim 1 , wherein the candidate carriers information comprises single-carrier bearing maximum supportable downlink transmitting rate and current load information.
9. The method according to claim 1 , wherein the number of the bearing carriers N is the minimum number in the number of the bearing carriers capable of satisfying the downlink traffic rate requirement.