SMOOTH TRANSITION BETWEEN PREDICTIVE AND MOBILE-ASSISTED SPECTRAL ALLOCATION
Technologies are generally described for providing a transition between predictive and mobile-assisted spectral allocation. In some examples, wireless devices may be enabled to determine adequacy of their allocated spectral path to meet their communication needs by analyzing signal-to-noise ratios (SNRs) of their assigned sub-carriers. If a wireless device determines a current sub-carrier to be inadequate based on the analysis, d may send information associated with preferred sub-carriers to a base station. The base station may determine one or more nearby good clusters based on a comparison of a sequence of received preferred sub-carriers and the spectral paths represented by the nearby duster centers, and select a re-allocated spectral path with shortest information distance to the sequence of preferred sub-carriers.
1 . A method for a mobile device operating in a wireless network configured to transition between predictive allocation and mobile-assisted spectral allocation, the method comprising:
determining that a quality of service (QoS) at a current spectral path is below a threshold;
determining a preferred spectral path;
transmitting a channel quality information (CQI) to a base station configured to communicate with the mobile device over the wireless network; and
in response to a determination that a new spectral path is received from the base station, scheduling a next reception at the new spectral path, else
scheduling the next reception at the preferred spectral path.
2 . The method of claim 1 , further comprising:
monitoring an actual number of bits received and comparing the actual number of bits received to a scheduled number of bits received.
3 . The method of claim 2 , wherein determining that the QoS at the current spectral path is below the threshold further comprises:
determining from the comparison that the actual number of bits received is less than the scheduled number of bits received by the threshold.
4 . The method of claim 2 , further comprising:
prorating the comparison to a fraction of a packet that has been transmitted by the base station.
5 . The method of claim 2 , further comprising:
adjusting the comparison based on one or more of a utilized error correction mechanism and a channel condition.
6 . The method of claim 2 , further comprising:
in response to a determination that the actual number of bits received equals or exceeds the scheduled number of bits received, scheduling the next reception at the current spectral path.
7 . The method of claim 1 , further comprising:
determining the CQI by:
performing amplitude measurements at one or more pilot sub-carriers;
setting amplitude value to zero at one or more traffic sub-carriers;
performing a Fourier transform of a combination vector of the pilot and traffic sub-carriers; and
determining one or more traffic sub-carriers with highest signal to noise ratios (SNRs) as preferred sub-carriers for the mobile device.
8 . The method of claim 7 , further comprising:
providing sub-carrier specification information for the preferred sub-carriers for the mobile device to the base station.
9 . The method of claim 1 , further comprising:
providing coherence bandwidth information associated with the new spectral path to the base station.
10 . A mobile device operating in a wireless network configured to transition between predictive and mobile-assisted spectral allocation, the mobile device comprising:
a communication interface configured to communicate with a base station over the wireless network;
a memory configured to store instructions; and
a processor coupled to the communication interface and the memory, the processor configured to:
determine that a quality of service (QoS) at a current spectral path is below a threshold;
determine a preferred spectral path;
transmit a channel quality information (CQI) to the base station through the communication interface; and
in response to a determination that a new spectral path is received from the base station, schedule a next reception at the new spectral path, else
schedule the next reception at the preferred spectral path.
11 . The mobile device of claim 10 , wherein the preferred spectral path comprises a subset of time-frequency vectors allocated to the mobile device with signal-to-noise ratios (SNRs) higher than a predefined threshold.
12 . The mobile device of claim 10 , wherein the new spectral path is received from the base station in response to a determination, by the base station, that a particular nearby cluster corresponding to spatial and temporal grid points near present space-time coordinates of the mobile device has a time-frequency vector distance that is less than a particular threshold when compared to the preferred spectral path.
13 . The mobile device of claim 12 , wherein the new spectral path comprises one or more time-frequency vectors in the particular nearby cluster.
14 . The mobile device of claim 12 , further comprising a cluster database, wherein the mobile device downloads information associated with the particular nearby cluster for storage within the cluster database.
15 . The mobile device of claim 10 , wherein the next reception is scheduled at the preferred spectral path until the base station determines a particular nearby cluster that has a time-frequency vector distance that is less than the particular threshold when compared to the preferred spectral path, and provides a new spectral path to the mobile device that comprises one or more time-frequency vectors in the particular nearby cluster.
16 . The mobile device of claim 11 , wherein the wireless network is one of an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access Network (eUTRAN), a long term evolution (LTE) network, an LTE-Advanced network, a high speed packet access (HSPA) network, or an advanced HSPA network.
17 . A system operating in a wireless network configured to transition between predictive and mobile-assisted spectral allocation, the system comprising:
a base station; and
a mobile device, the mobile device comprising:
a communication interface configured to communicate with the base station over the wireless network;
a memory configured to store instructions; and
a processor coupled to the communication interface and the memory the processor configured to:
determine that a quality of service (QoS) at a current spectral path is below a threshold;
determine a preferred spectral path;
transmit a channel quality information (CQI) to the base station; and
in response to a determination that a new spectral path is received from the base station, schedule a next reception at the new spectral path, else
schedule the next reception at the preferred spectral path.
18 . The system of claim 17 , wherein the base station selects a particular nearby cluster corresponding to spatial and temporal grid points near present space-time coordinates of the mobile device.
19 . The system of claim 18 , wherein the new spectral path is received from the base station in response to a determination by the base station that the particular nearby cluster has a time-frequency vector distance that is less than a particular threshold when compared to the preferred spectral path.
20 . The system of claim 19 , wherein the base station transmits to the mobile device at the current spectral path until the CQI is received from the mobile device.