# Comment by IEEE 802 in Liaison Statement to 3GPP RAN1 Previous status Current status 1 Radio equipment in unlicensed spectrum should not transmit Possibility for consensus Consensus, energy for the primary purpose of blocking access to the & resolution subject to additional channel to others RAN1 spec work 2 Transmission of Discovery Reference Signals should be clearly Some consensus, Consensus, bounded to avoid excess airtime overhead on unlicensed but not fully resolved subject to field spectrum experience 3 Radio equipment in unlicensed spectrum should detect No consensus, No consensus, neighboring networks with sufficient sensitivity to ensure fair and not resolved but possible with RAN4 coexistence testing 4 LAA and IEEE 802.11 slot boundaries should align as accurately No consensus, No consensus, as possible to preserve spectral efficiency in unlicensed and not resolved but possible with RAN4 spectrum & field testing 5 LAA and 802.11 multi-channel aggregation schemes should No consensus, No consensus, align wait for measurements wait for measurements 6 Radio equipment in unlicensed spectrum should stop Possibility for consensus Consensus, transmission as soon as transmission of useful data is & resolution subject to use of short complete sub-frames 7 Channel access that is obtained using special access Consensus Consensus, mechanisms for high priority data should not be used to but not fully resolved subject to use of short transmit lower priority data sub-frames 8 The maximum continuous transmission time should be limited Consensus No consensus, to avoid blocking latency sensitive traffic on coexisting but not fully resolved but possible with RAN4 networks & field testing 9 Adjustment of channel access contention window should be No consensus, No consensus, based on comparable indicators of congestion to ensure wait for measurements but possible with use of fairness between technologies short sub-frames 10 Adjustment of channel access contention window should be Consensus, Consensus, clearly defined and resolved and resolved 11 The channel access state machine during channel sensing Consensus, Consensus, should be clearly defined and resolved and resolved 12 The use of the back off mechanism should be clearly defined Substantial consensus, Consensus, but not fully resolved and resolved 13 Issues related to ED threshold and coexistence between LAA n/a No consensus, and IEEE 802.11 but possible with RAN4 testing 14 Continued dialog towards a future framework for efficient n/a Waiting for RAN sharing of the 5 GHz band decision
# Comment by IEEE 802 in Liaison Statement to 3GPP RAN1 Previous status Current status 1 Radio equipment in unlicensed spectrum should not transmit energy for the primary purpose of blocking access to the channel to others Possibility for consensus & resolution Consensus, subject to additional RAN1 spec work 2 Transmission of Discovery Reference Signals should be clearly bounded to avoid excess airtime overhead on unlicensed spectrum Some consensus, but not fully resolved Consensus, subject to field experience 3 Radio equipment in unlicensed spectrum should detect neighboring networks with sufficient sensitivity to ensure fair coexistence No consensus, and not resolved No consensus, but possible with RAN4 testing 4 LAA and IEEE 802.11 slot boundaries should align as accurately as possible to preserve spectral efficiency in unlicensed spectrum No consensus, and not resolved No consensus, but possible with RAN4 & field testing 5 LAA and 802.11 multi-channel aggregation schemes should align No consensus, wait for measurements No consensus, wait for measurements 6 Radio equipment in unlicensed spectrum should stop transmission as soon as transmission of useful data is complete Possibility for consensus & resolution Consensus, subject to use of short sub-frames 7 Channel access that is obtained using special access mechanisms for high priority data should not be used to transmit lower priority data Consensus but not fully resolved Consensus, subject to use of short sub-frames 8 The maximum continuous transmission time should be limited to avoid blocking latency sensitive traffic on coexisting networks Consensus but not fully resolved No consensus, but possible with RAN4 & field testing 9 Adjustment of channel access contention window should be based on comparable indicators of congestion to ensure fairness between technologies No consensus, wait for measurements No consensus, but possible with use of short sub-frames 10 Adjustment of channel access contention window should be clearly defined Consensus, and resolved Consensus, and resolved 11 The channel access state machine during channel sensing should be clearly defined Consensus, and resolved Consensus, and resolved 12 The use of the back off mechanism should be clearly defined Substantial consensus, but not fully resolved Consensus, and resolved 13 Issues related to ED threshold and coexistence between LAA and IEEE 802.11 n/a No consensus, but possible with RAN4 testing 14 Continued dialog towards a future framework for efficient sharing of the 5 GHz band n/a Waiting for RAN decision
19-17-0030-01-0000-proposed-response-to-most-recent-liaison-from-3gpp-related-to-laa.docx