A computer-implemented method for lockless communications network resource quota sharing, the method comprising: at a first charging node of a distributed charging system comprising multiple charging nodes, wherein the first charging node is for handling communications network resource quota requests associated with a first member of a shared resources plan, wherein a second charging node manages resource reservations associated with the shared resources plan: receiving, from a requesting entity, a first communications network resource quota request for requesting a first resource amount from the shared resources plan; without confirming that the shared resources plan has enough available resources to allot the first resource amount, providing, to the requesting entity, a first communications network resource quota for the first member, wherein the first communications network resource quota indicates a second resource amount less than the first resource amount and/or wherein the first communications network resource quota is associated with a validity time indicating when the first communications network resource quota expires; and sending, to the second charging node, a first resource reservation request for reserving resources of the shared resources plan. at a first charging node of a distributed charging system comprising multiple charging nodes, wherein the first charging node is for handling communications network resource quota requests associated with a first member of a shared resources plan, wherein a second charging node manages resource reservations associated with the shared resources plan: receiving, from a requesting entity, a first communications network resource quota request for requesting a first resource amount from the shared resources plan; without confirming that the shared resources plan has enough available resources to allot the first resource amount, providing, to the requesting entity, a first communications network resource quota for the first member, wherein the first communications network resource quota indicates a second resource amount less than the first resource amount and/or wherein the first communications network resource quota is associated with a validity time indicating when the first communications network resource quota expires; and sending, to the second charging node, a first resource reservation request for reserving resources of the shared resources plan. receiving, from a requesting entity, a first communications network resource quota request for requesting a first resource amount from the shared resources plan; without confirming that the shared resources plan has enough available resources to allot the first resource amount, providing, to the requesting entity, a first communications network resource quota for the first member, wherein the first communications network resource quota indicates a second resource amount less than the first resource amount and/or wherein the first communications network resource quota is associated with a validity time indicating when the first communications network resource quota expires; and sending, to the second charging node, a first resource reservation request for reserving resources of the shared resources plan.